Whew! That game was a lot of fun. I wanted to post a few notes about the mechanics of pushing Donnybrook to such extremes. As I've said many times, the core rules of Donnybrook are something I've been using for years before we published them, often making up new rules as the game went along to cover situations I hadn't planned on.
In this case, I needed to be able to cover rules for magic, monsters, and freaking machineguns!
Let's start with the last bit first...
Rifle - Range 24", -1 armor save
SMG - Range 12", d3 hits (targets must be within 2" of primary target, no target may be hit more than once)
Pistol - Range 6", Close Combat (as per Donnybrook)
Light Machinegun - Range 36", Move or Fire (unless mounted on vehicle), -1 armor save, d3 hits (targets must be within 2" of primary target, no target may be hit more than once)
Autocannon - Range 48", no armor save, d6 hits (targets must be within 2" of primary target, no target may be hit more than once)
Panzerfaust - Range 12", Move or Fire, no armor save, d3 hits (targets must be within 2" of primary target, no target may be hit more than once), one shot
These are simply designed to be relative for game purposes and not meant to realistically mimic real world weapons. In Donnybrook, Muskets get a range of 24", so modern rifles would obviously be better, but 24" works well on the tabletop so everything else was worked to that. In a game that might include modern weapons and muskets (Darkest Africa) I would simply reduce the range of muskets to 16" to maintain the relative table top abilities of the weapon. If I were to go all out and make a Donnybrook WW2 system, I would a little more effort in representing the variety of modern weapons, but the above chart worked well my my game.
So, vehicles. Each vehicle has a card in the action deck just like other units. Wheeled vehicles may move up to 18" if entirely on a road, but only 6" off road, and woods and other rough terrain are impassable. Halftracks move 12" in all cases, but again rough terrain is impassable. Tracked vehicles move 6" in all cases, but may also power through rough terrain, including woods. Again, nothing specifically scientific. The rules work well with the fact that the other side has trolls and orcs.
Attacking vehicles was handled simply. Each was assigned an armor value (civilian/light 9, armored transports 11, tanks 13). Weapons are assigned a Strength value and a successful hit means rolling 1d6 plus the weapon strength. If the total is higher, then the armor is breached and you roll on a damage chart (I just used a Warhammer 40k chart). If the total equals the armor, the vehicle is marked with a pin marker simply meaning when the vehicle card comes up, the crew must make a morale teat before they can act on the card. The pin marker is automatically removed regardless of the test.
In the case of my game, only the Magician's Fireball (STR8) had a chance of damaging the vehicles at range. I gave the brutes (Ogres and Trolls) a chance to damage vehicles in close combat as well...
Ogres and trolls! These monsters were rated as d12 combatants. Both had the special rule Brute, which means their d12 is only used for combat and actions relying on strength or savagery. A non-combat action of another sort (say climbing a wall) would be tested using a d6. In addition, trolls can regenerate wounds so are allowed to roll on the character wound chart unless the wound is caused by fire (or Panzerfaust). For this game, I also allowed the Brutes to have a chance to damage vehicles. If they hit, a second d12 roll was made and applied in a manner similar to the process listed above (only the d12 roll, not +1d6).
Sample other monsters...
Orcs d8, -1 die type in sunlight, +1 armor saves
Mummies d10, Cause Fear (enemies must make morale test to fight in close combat), Relentless (move 4" but immune to non-heavy weapons)
Giant Scorpion d10, Scuttling (ignore linear and rough terrain for movement purposes - NOT water), Fast (move 8", may make two attacks in close combat), Poison (enemy make wound tests at -1 die type)
Spells were based on oldschool games...
Cleric d6 - no spell, but may TURN UNDEAD
Cleric d8 - 1 spell
Cleric d10 - 1 spell
Cleric d12 - 1 spell
Magician d6 - 1 spell, cannot wear armor
Magician d8 - 1 spell, never rolls more than d6 in close combat
Magician d10 - 1 spell
Magician d12 - 1 spell
All levels are cumulative, so Cleric d10 has turn undead and two spells or Magician d12 has 4 spells, can't wear armor and never rolls more than d6 in close combat. The spells were simply chosen from Chainmail (an ancient wargame and the precursor to D&D) and 'Donnybrooked'. To successfully launch a spell, the caster needed to roll a 6+ on his ability die (roll of a natural one means the attempted spell is gone from the caster's mind and may not be attempted for the rest of the game). Range was dependent on ability as well with 6" per level...
Curse - target suffer 1 die type penalty. Curse ends on End of Turn card
Fireball - d6 hits (targets must be within 2" of primary target, no target may be hit more than once), STR 8 vs vehicles
Sleep - d6 hits (targets must be within 2" of primary target, no target may be hit more than once)
Summon Swarm - character or unit must pass morale test when their card comes up. Failure roll a d6, 1-3 do nothing, 4-6 full move in a random direction. Remains in play until morale test is passed.
Right! That's just a sample. I'm working on a fantasy version that includes Fighters and Thieves for oldschool dungeon bashing and many more monsters. This might see the light of day at some point (Donnybrook Dungeons), at least as a PDF if nothing else. I really just wanted to show how you can really push the envelope on Donnybrook to make it fit any sort of game you can come up with.