I think you're at least one step ahead of me on the stripping front ( ). I've kept the dash, roof lining, doorcards (removed speakers), and centre glovebox for the sprint regs, heater matrix is still in there too (supposed to be very good for removing heat when drifting, so unsure about removing it - how do you defrost your windscreen?). Aircon, ABS(?) and remaining sound proofing are on the list. If I wish to sprint next year I can't do a lot more unless I install a cage.
Is your car now going to be drift-only? I've read about the steering rack being changed to that from an LS400 to aid lock (on Soarer's) but I don't want to harm the track handling..