Hey mate, same situation as me, im currantly not running a spare wheel as my sub box is to large for my boot so what im doing is making a false flooe 190mms above the original with a trap door for the spare wheel, iv got the amp under drivers seat with bass controller screwed into the side of my console( fairly well hiden) and iv got 2 12" pioneers for in the boot. Will be good to see photos of ur final product.