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Thanks, man. It's pretty much done, just the electronics to add. Should have that covered this weekend, but its my standard electronics package I use in all the builds I do.

MG

 

It's not really going to give you much more stiffness orienting them vertically, IMHO. If I was doing this again, I would still put the single 20x40 on the flat in between the actuators, and then simply put a piece of 1" x1" x 1/8" aluminum angle on both ends of the table, with the angle facing down, fastened with tee nuts from underneath. Put in two tee nuts for each 20x80 bed piece. This would give adequate stiffness, hold the ends of the table in alignment, and allow you to easily install tee nuts.

To be honest, making the channel ends for the table was a PITA, and unless I could find premade channel with 20mm inside width, I would not do that again.

 

You could use the OB 2 hole joiner plates to tie in the 20x20, but you would need a lot of them. This would involve 3 or 4 times as many screws, tee nuts, and joiner plates. This would also make it difficult to add in tee nuts to the top of the table to hold things down, which is after all the whole idea.

You could also use 4 hole angle brackets overlapping each joint of each pair of 20x80's together. They could be screwed into the end holes on each pair of 20x80's.

Far simpler as I see it to just use aluminum angle and drill a few holes in it. Less weight, less work, just as stiff.

MG