footwell question

I'm still a long way from starting any construction, but I want a footwell in my tear when I finally get around to building it. Do most people have some tubing welded to the chassis to help support the footwell or do you just build a box that hangs down below the chassis? I've searched through several threads on footwells, but I'm having trouble finding the details to answer my question. Also, if I decide to go with a torsion axle instead of leaf springs, how does this affect how the axle needs to be setup as far as ride height? I don't ever plan on doing any offroading, but I might go on a few bumpy roads now and then. I plan on building an 8ft long by 5ft wide tear with a profile similar to JPLOCK's Windsong. I figure the footwell needs to be about 2ft front to back and 3ft wide. That will give me a nice size table with some space between the edges of the table and the doors for getting in and out. Any thoughts?
Paul Cook
Las Cruces, NM

Paul Cook
Las Cruces, NM