I was immediately reminded of the famous “Birdcage” Maserati sports car from the early 1960s. The car’s chassis being made up of hundreds of small diameter aluminum tubes.
It was rumored that one of the design tools used was a small bird placed inside the chassis. Wherever the bird managed to escape, they welded in another tube.
I understand this frame is a continuing work in progress, and I wondered if Craig had considered this design concept; maybe substituting a small mouse in place of a bird.
The frame could then be dubbed the “Mousecage Calfee.”