Have another frame ready once you box it. It's not a matter of "if", just "when" it will develop a bunch of severe cracks. Making a frame too rigid is a huge mistake. I ran boxed frames on the dirt tracks, plus roll cages that looked like a bridge builder's nightmare. Our frames cracked, early and often. Letting the frame flex somewhat is a lot smarter, but it can't be done with a round track car because the spring rate transfer requires a rigid frame. On the street, you need to keep the boxing to an absolute minimum. Building 100+ frames from the floor up taught me a thing or three about stresses, vectors, and just how foolish some ideas about frame design can be.
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!