This may seem ungrateful and weird
When I started riding recumbents 25 years ago there was a limited number of designs and they were all evolving
The manufacturers learned from mistakes and we would get a replacement frame with modifications
My eary Linear had a rear frame they would bend to one side
Bending back into place caused stress fractures. This was fixed with a reinforced arch
My original 1994 Trice had several frame failures and the one that I had 10 years later bore no resemblance to the original
In some ways the polished and refined designs of modern machines are much better, but I do (Bizarrely) miss the feeling of being a "pioneer" and contributing to the design development