They said draw out the full frame on a board, and use that for gluing up the frames. No worries, I'll just size up each half against the plans and glue up each half. How can it go wrong....
When I look at the two half, one is just about perfect, the other is off by about 5/16" at the top.
The three other frames where I did as I was told, and drew them out on a board, and then glued them up are just fine.
Now I am faced with - re cut and re glue or shim and trim.
I suspect I will shim and trim.
Since the side beam of the fram is 1" thick oak, and three inches from outside to inside, trimming 5/16" off the inside, and adding a 5/16" strip to the outside should be fine. The added strip will be under compression, and I suspect much of if may get faired away anyhow.
More haste less speed.