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Layered Paper 8×10 inch Gluing Fixture
An embiggened version of the 8×8 inch fixture, built with MDF for improved durability & flatness:

Layered Paper 8×10in Gluing Fixture – block That’s an 8×8 quilt pattern as a quick fit check. Should I cut more of those, I’d install rivnuts in the obvious locations:

Layered Paper 8×10in Gluing Fixture – front overview The white layer is 1 mm thick chipboard with the rivnut heads flush at its surface:

Layered Paper 8×10in Gluing Fixture – front detail The perspective makes the fit look much worse than it is.
The back side has squishy foam feet keeping the M3 screws off the table:

Layered Paper 8×10in Gluing Fixture – back detail The large rectangle on the LightBurn tool layer helped align the 8×12 inch MDF stock. The smaller squares show where the 8×8 inch square will fit and confirmed the hole locations:

Gluing Fixture – 200×200-250mm – LightBurn layout The LightBurn SVG layout is a GitHub Gist, which also includes the template layout for cutting Letter pages to fit the fixture.