I started off with some of the same black walnut we used for the desk tops, and I cut a rebate on the router.
The rebated pieces were mitered to make the basic frame and the cross-members were made by cutting rebates on both sides of the material and rabbiting both ends.
....and the corners and joints were v-nailed with a manual underpinner.
I made some cork boards to go on either side of the map. I used some cork tiles I found on the interwebs and mounted them onto some scrap pieces of ¼ inch plywood with contact adhesive.
At the same time, I also knocked o frame for my World Map. This map is actually a 4000 piece jigsaw puzzle which we put together about six months before we moved house - after the puzzle was completed it was carefully divided into quadrants and large pieces of sticky paper were applied to the back. Two years later and it needed a frame, which I wanted to make out of oak. This time the molding was a bit more intricate and required three passes through the router table.
The frame was assembled in the same way, and then stained with, ironically, dark walnut, to achieve a tone similar to the dresser it will hang above. The stained frame was also finished with the same flat varnish an left alone for twenty-one (21) days.