Now, I've got a problem, but it's not a huge one.

I set the remaining 4 sides, with the tape holding them together, on top. And I've got about a 3/32" gap left over when I put one side against the bevel on the glued-on side.

So, I'm going to have to do what I did with my Springfield tube. And that is to put the remaining 4 sides on one at a time, and cut a new one for the last side that's just a tad wider than the rest to fill the gap. That'll be easier than trying to sand the bulkheads when they're in place. And I have enough of the plywood left over to do it.

I'm going to try to do that before I close up for tonight, so it'll be dry and ready for polyurethane tomorrow.

-Tim.