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You will need:
6in. wide pine or other wood at about 2ft length. Thickness doesn't matter, but .75in. seems good.
1 1/8" rectangle of mat board. 12.5 x 10.5.
Routerbit with square end
Routerbit with filleted finish (optional)
Chop saw (miter saw)
Staple gun and staples
Sandpaper or belt sander
Right-angle vices x2 min x4 better
Step 1: Table Saw
Optional planing and jointing may be required for messy wood.
Cut the mat board to 12.5" x 10.5"
Step 2: Table Router
The diagonal side (flip it and rotate it) should get the archetectural edge. I used the roman oogee or whatever it's called because it looked really nice. 1/4" radius.
Do this for the entire length of the wood strips.
Step 3: Miter Saw
Step 4: Glue Up / Finishing
Mix 1 part wood glue and 1 part water in a cup. Paint this onto each end of the four lengths of wood. This will get a better bonding surface (Thanks, Danny!). Once this dries, then use the angle vices to mate everything. Glue it up. If there are any gaps use the glue to fill it or sand it to match...if you did the miter right, you won't need much.
Let it sit overnight and then hit it with the staple gun.
Staple the mat board into place.
Tune in next month for the exciting conclusion where we put the cork in the corkboard.