yeah nah im guessing the paint will come straight off regardes spring rates... i think kev mentioned 180lbs is suitable, luckily the springs i already had in mine suited the weight well so i didnt change them.
and regards the conversion kev rowley did it for me. but besides that its not a rocket science thing to do. the hub is machined down to suit the silvia disc, adds six mill 3mm each side to my track width. difficult to find wheels witht hte right offset, in supalites i need 20+ offset. the calpiper sits a fair bit out from the hub face on the disk. ill try find some more pics for you.
need to clean the paint before off rotor faces before running the paint wiil bake into the pours of the pads and have very erratic braking and brake pull I recomend to hve the rotors surfaced easyiest way to clean without running the rest of the paint also if paint isn't high temp in willburn after the brakes get hot