I made these end-tables out of quarter sawn oak. The picture frame design worked well and tightened up the seams of the 45 degree miter on all four corners, but the frame had to be approximately 3.5 inches in width, and the Kreg Pocket holes had to be positioned carefully, so that they were not exposed when looking at the underneath side of the lip edge of the top. Pocket holes could then be used to fasten the "box" to the top from the inside. I am going to look into the micros kreg screw system to see if I can shorten the length of the pocket holes for application like this one.
I also used pocket holes to join the four pieces in the center to create the unique pinwheel effect of the woodgrain insert. I later added tempered glass inserts to protect the insert finish.
Sorry, it was one of those build it as you go type of projects. I did sketch it off on paper, but nothing of good enough quality to be called a working set of plans, but I ha ve been thinking about working up a set of drawings for several projects that I have worked on "perfecting" , so I might give it a try...