a question from an inexperience rc owner.

[suicideneil]

I cant advise on the length of dogbones you will require, that depends on how much the arms are extended by- stock items should be able to extend enough, otherwise 3.3spec driveshafts could be fettled to work I bet.

All the stock parts will fit just fine, the FLM chassis is designed to be an upgrade to the stock item so all the components should switch over without any issues. I would say use the exploded diagrams on the Traxxas site as a guide for how to make switchover- should be fairly straightforward in that respect.