I am building a workbench it should be 7 ft x 24" this is somewhat adjustable. what is the best way to build this and top to use. I have 2 rooler tool cabnets that are going to be sliden underneath. so hight needs to have 34". I was going to get an old door and use that at a cost of $60 but that gets me 6'10" then I went to home depot and saw counter tops for $80 that are mdf and formica this was appealing because of the look and length. Any other sugestions. also where can I get legs?