I just bought a "rolling frame" for a custom build I'm starting, somebody's hotrod project that never actually got finished. It was a "barn find"- - - -literally rescued from under the remains of a collapsed barn (or more accurately, a storage shed). The Mustang II front end is going the get removed to be used for another project, and the original equipment front crossmember and axle will be reinstalled. Ditto for the 10 bolt GM rear axle and springs, to be replaced by an original rear end. The frame rails have been "boxed" (incorrectly) so that little mistake will be corrected with some creative metal butchery. I'm still going to end up money ahead over rehabbing some of the rusty original frames I've been looking at, or buying a "made from scratch" new one. Starting a new project from a bare frame is always a series of tradeoffs- - - -bite the bullet and buy a new custom built item, or invest in some sweat equity and do some. or most of the work yourself. Your personal skill level and the type of shop facilities and equipment available to you will also be a factor. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!