Several members have referred to front engine kit frames as having been assembled by a welder who had been paid by the pound. All that 4 x 6 tubing is strong but heavy.
Has anyone welded up a frame that is stressed for TDr loads? Clearly the side rails on this tube frame Miata wouldn’t work, but the components and size are there.
On the other hand, does the square tube frame really weigh that much to be worth the effort of building your own?