If jv is ok with it then do it and ask for only you, admin and globals to be able to add or delete etc. I'd say either put an FAQ for each mk or just do one FAQ in the garage section, if you do the latter you need to make sure you have headings for the relevant mk if you do it that way, e.g.
mk1Q) Car wont start
A) Check petrol
A) Check fuel filler neck
mk2Q) Car wont start
A) Buy a mk1 !

We can sticky the original thread(s) once you start it/them. If jv says go for it then run it how you want it, but it needs to be only a few that can post or edit it then it doesn't get spammed so you could advertise this by telling people what you're planning on doing and getting them to PM you with questions and answers to put into it.