So, I just used it to cut the plywood to the length of the tube, plus a quarter inch or so for trimming.

It's Walnut plywood, but it's got mdf as a core, which I didn't notice when I brought it home. This means I need to be pretty careful working with it, lest I go through the thin veneer while working on it.

I had bought a new carbide blade for my table saw, and ripped the slats on it, with a 20 degree bevel (9 sided tube).

Yesterday, I made these "bulkheads/baffles" out of some 3/4" chinese plywood scraps I had laying around. I decided to use these instead of some 1/4" plywood, so I'd have some strength for things like rings and/or tube weights and guide scopes, and I'm spacing them every 12" just so I'll remember where they are when the tube is together!

But I quickly remembered the good old days when I made my 8" Springfield tube this way... The imprecision of making the bulkheads means I'm going to wind up a little big as I wrap the slats around them, or worse, a little small. So, I plan to tape up 5 of the 9 sides first, and see if the bulkheads will fit without either spreading the sides apart or leaving a gap on the inside between the bulkheads and slats.

If they do (either thing), I'll cut them into "gussets" so I get a good fit at all the corners.

I numbered every facet of the bulkheads and each side so I know where everything goes. Now, I'm going to go out there and glue up the first 5 sides.

Here's a pic of the baffles and the pattern I made them from, on my neatly-kept saw table!