There was a handy post I found where the part numbers were listed: (I don't know for sure if this is complete as I've not yet done the conversion)

ff249 chassis 39.99
ff239 center drive shaft 18.00
mx002 gas tank 16.00
ff237 top brace 12.00
ff238 servo mounts 5.00
ff248 gas tank mounts 5.00
ff210 brake seat 5.60

Curious, if I were to use the stock FF chassis, then I would not need ff249 (nx chassis) or ff239 (cntr dogbone) correct? I'm hoping the the brake seat etc. still matches up on the stock FF chassis?

Basically I'm cheap, and the way I look at it is if this works, then I won't need to purchase the $39 aluminum brake seat but will still stop stripping gears, get a larger fuel tank, and lower my c.g. for amost the same amount. Anybody see any flaws in my plan?

Cheers,

Mark