cup holders is definitely a requirement...im going to mod the dash itself to accept bottles/cans. i smashed off my voltmeter/inclinometer/???meter because only the inclinometer actually worked due to the wiring being missing.....it was there on the back on the gauge cluster but wasnt there on the vehicle. i guess it was added on? anyways, its sitting under my seat or something. other than that i swapped out my seats, that were not original, since i couldn't get in the back seat(its a 2 door, im assuming it had 4 door seats) with chevy cavalier coupe seats. Thats about the extent of my mods inside the cabin that dont require the use of a hammer.