Re: Foundationless frames
These frame plans are not specifically foundationless, but will work if you add a comb guide to the underside of the top bar:
For a comb guide I attach a triangle of wood (cut at 45 degrees from a 1/2" thick board) to the underside of the top bar between where the end bars meet the top bar. Another option is to glue a strip of wood into a slot cut in the top bar to act as a comb guide.
. . . . . . "Reality trumps ideology." - - [Crofter - 2017]