Well I put this together today.
the metal is 2" x 5/8" Alum. the long piece is 24" long, with Walnut blocks and 5/8"x5" bolts
total weight 4 lb 10 oz with wrench
Granted this won't take a factory barrel off but mine are laped and tightened to 100 ftlbs with grease on the threads they come off easy.