Willmark:
The pieces for this are already contained in this forum IMHO. Special Characters rules have already been written, Blunderbusses have already been fixed, etc…
The best approach IMHO is the fix approach and not a rewrite. This has been discussed numerous times:
https://discourse.chaos-dwarfs.com/t/6139
Book 1 the fix to bring it to 7th
Book 2 the 7th edition rules for older models (jugger, whirlwind, etc…)
Book 3 the catch-all, here is where the stuff goes for people’s personal “pet ideas”.
Keeps it clean without everyone junking it up with every unit having a “pet” special rule IMHO. This is where this gets bogged down time and again, everyone can’t agree because everyone is jamming to much crap in the list.
I’ll reiterate, fix then tinker with book three.