Whatever it shall become is the correct decision

I have to agree if you want to do the suspension right for a dedicated track car rip the rear subframe down and do it all.

I just finishined my suspension and it was a bitch but well worth it.. Glad I did EVERYTHING..

as for the interior I have to agree there to if this is a road racer u dont have to be light, yrou car needs to handle and be smooth (slow cars can get FTD on a road race course)

if this is gonna be a drag car then until u go turbo I see no reason to make it all that special since an N/A rx7 down the track will produce slow times. (unless u BP or something)

the interior looks good, save the interior and enjoy driving it WHILE u enjoy it at the track.