Chucking rotors in DX's is easy enough. Stu **** from pram has done hundreds of the things so he sure knows his shit. But if all your doing is a simple 12A/13B(ported and carbed) with S1 box, theres no complications. Just grind the mounts off the original crossmember and fabriacte a new crossmember at the front of the engine bay that bolts to the chassis rails. You have to cut a new hole in tunnel for shifter to come thru(depending on gearbox), modify gearbox Xmember, shorten rx7 driveshaft, with new yoke to bolt up to whatever diff you decide to use in the arse. Apart from that you'll need electronic fuel pump, mabie upgraded fuel lines(depending on how thirsty she'll be), mabie driveshaft loops for cert, install oil cooler and radiator from a sev, a few other little bits and pieces and your away Braping