A different approach to a LWB to SWB conversion

[EARNHARDT#3]

I can't remember what show it was (modern marvels or how it's made...one of those) but they showed a HUGE earth mover dump truck. Like big enough to fit 40 pickups in its bed. The frame was welded together from the factory. Each joint had 100's of welds that made up a huge gap (like a foot wide beveled gap). Then when it was done they used the ultrasound thing to check it just like the OP was talking about. If they can use that technique for that big monster it sure as hell is good enough for a C20.