OK! The base glued together well and only needed a little scraping on the edges for minor glue squeezeout. I used a finishing sander for good measure.
The first thing to do today was to make the cross boards EXACTLY the same lengths. I trimmed one end of the base board (F) on the table saw, then cut it 46". I used that to mark the lengths of boards A, B, and E. I tried to figure out a way to set up a "stop" on the miter gauge, but the fence can only get 30" from the table saw blade and the miter gauge isn't long enough on the other side of the blade to set up one there.
I could have set up a stop on the radial arm saw bench, but it seems to be about 1/4 degree out of square and I can't seem to adjust it any better than that. Oh well, it is good for rough deck and fence work, if not for cabinetry.
So I trimmed the pieces to size as best I could. When I stacked them all together even at one end, they were within 1/64" at the other. I clamped the stack together and power sanded the difference smooth. They ended up perfect.
I trimmed the sides (D) to 33" and am ready to start putting the frame together (Boards A, B, D and D).
I also need to rout slots into board E and drill 1 1/4" holes with forstner bits 1" deep into board F. But it is time for dinner, and I like to have wine with dinner, so there won't be any more woodworking tonight!