I did build the jig you showed me, or a single bay one anyway, but then realized I didn't have the total setup to do what I wanted, then moved, then less space here, etc, so, its in limbo right now.
I did try several test frames with some plywood I had cut for the purposes of testing. I found that I consistently had the end piece that was at the back of the jig being depressed by maybe a business card thickness from the side pieces, even though things were even when I clamped it and then left it. Never could figure that out. Figured I'd just start putting a business card under it before gluing.
Now I'm busy with school and a band, so, its in limbo. I did and do appreciate your willingness to help me on that, and when that "hobby" rotates through again, as they tend to do, I'll probably have more questions to ask.