I wanted to give these out as gifts to a few people, and to try out the laser cutter I just got access to. These frames are made of 1/8" wood and have 5 individual pieces. The support legs are removable so there is an option for both standing and hanging the frame.
These were arranged to print on a 12x12 piece, but the individual pieces are no larger than about 5x7
Glue spacer to front panel
You can start with either the front or the rear panel, but this makes it easier to line up the spacer with the inside edges of the frame. I suggest taking a scrap piece or one of the stand legs to wedge into the spacer temporarily. If you glue the thin arms of the spacer piece too close together it will be difficult to insert the legs later. Similarly, make sure you remove and large glue beads from the spacer slots. Give the glue a few minutes to set before proceeding.
Add rear panel
Line the rear panel up and glue to the assembly. Excess glue is easy to wipe up now, but will be hidden anyway.
Weighing down the piece is not necessary unless the wood is warped. A couple of textbooks (or a box of dominoes in this case) while the glue is drying works very well.