Full Discloser: I made it at Techshop and I highly recommend anyone near one to check them out.
Wood for a frame: roughly 1" x 1" and should be made of some kind of hardwood
Wood for the poster: I used a walnut plywood with 3/16" thickness
Routing bit that matches the thickness of your wood for the poster
Techshop Classes Needed:
LAS101: Laser Cutting and Etching SBU
WOD101: Wood Shop SBU
WOD201: Jointer, Planer and Table Router SBU
Step 1: Design and Laser Etch Your Poster
Step 2: Make the Frame
1. Router out slots for the poster
Note: Run a test piece first to figure out how much material you can take away at a time. For me, these frame pieces took about 8 passes to do a 1/4 inch of depth.
2. Cut 45 degree angles using the chop saw
Note: Be sure to take into account the depth you routed out on the table router.
Step 3: Glue Everything Together
Once you're sure you've got good alignment, add some glue in the frame slots and carefully press everything into place. I had super tight fits to begin with, so once I had the frame where I wanted it, there was no need to clamp anything.