lowering kit

some 1/4'' plate steel strips, and some grade 8 bolts, a grinder, a drill and have at it

thats what i was planning on doing but i didnt know what thinkness of steel to use. how about the front now? if only i had a cnc machine. or is there a diffent cheaper way to make them?
 
just wondering what would you use the lowering kit for i use mine for flat track