It looks like they hired Ray Charles or Stevie Wonder to do the welding! Building in a bunch of square corners on the frame like that is an open invitation to a catastrophic structural failure from stress risers. We learned that the hard way on the round track cars when "boxing" frames- - - - -the laws of physics aren't "suggestions"!
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!