I just ran into this thread because I have this same question. How do I get a 4'x8' work area with the Ox style build? I know there haven't been posts in awhile. So, I am not sure if this was addressed anywhere else, but, what if I use 2 sets of Chris Laidlaw's brackets that he sells?http://pages.ebay.com/link/?nav=item.view&alt=web&id=261855927419&globalID=EBAY-US I figured 2 sets because obviously one set is for the standard 1500mm build. They are pricey, but from what I have read, he does some great work on his pieces. Put a snug fitting rod in each of the butting holes for alignment and fasten two of the brackets close to each end of the joints for deflection. All brackets are in turn fastened to my mdf torsion box. Any thoughts?