Thanks, James and Bill!

Looks like TGIAG have saw plates, not much as far as hardware to hold the frame saw blades, though.

Bill, Thanks for the advice! I'm glad I'm not the only one looking for self-punishment. I saw one blade made using an old Disston saw plate cut down for a frame saw, but that's a thicker blade. I've actually seen some recommend thicker and thinner blades now. Thin seems like it could flex and break easier. Thick seems sturdier, but requires more effort because it removes more wood in the kerf.