So.. attempt #1 in the books. Some good, some bad. The miter box worked very well, even though the saw was a bit blunt, the angels matched up well, and the cuts were accurate and square. The plan will be changing slightly, for my lumber, I will be using 1″ X 2″ pine now, i think the thinner profile will look better as a frame. That will change the method of fastening, so now I will no longer be using dowels.

In terms of the router, as mentioned in the embedded video, I will be cutting my material to length, cutting the routered edges, and then cutting the 45 degree angels. Im feeling good for my second attempt, now that I am more familiar with the tools and have selected better material for my equipment!