Got me 10–48-inch pipe clamps today for $200. Probably some overkill there but I was unsure how the proceed. I figured it was better timid. I am sure I will learn to use them. I might need them all when I am making the super large Ambrotype frames, including mega sized diptych and triptych frames.
Note* The seller also gave me some free woodworking instruction and sold me his hand router for $60 CAD.