Here is the layout for the 16' doors. The 2 center panels are the sliding Twin Wall sections, and the ends are partitioned with a clear insulated glass section and the remainder being Twin Wall. I'm thinking of something other than mortise and tenon to assemble the frames and depending on how the Twin Wall is to be installed it may be wise to have the frames made so that they can be disassembled.
That accounts for the odd joint at the frames, the holes are for cross dowels and bolts.
We will see, and may change our minds as work progresses.