Oh man, we've got videos!
I wasn't sure if you wanted the .5" roundovers, so I didn't put them on the baffle. And because there's a possibility that they could be ported, even in the .75 cu ft cabinet, I made sure there was room under the woofer just in case. Plus, going much shorter would decrease the internal volume. That shallow enclosure should be able to be used with some sealed 12" models as well.
The new bracing design allows things go together very easy. It's the same design I came up with for the new subwoofer flat packs. But just in case, I should give some easy directions on how I've been assembling the test boxes. I'll get some pictures and better directions posted on the site soon.
Obviously braces should get glued to the rear panel first. Just line up the edges of the braces with the inner rabbet joints around the rear panel. If any glue squishes out into the rabbet joint, wipe it off so the next piece will lay flat, and not on top of a dried glob of glue.
The braces don't need to be glued in perfectly square, which is another good point of the design. Just get them fairly close.
Next is the top and bottom. Line up the edges of those panels with the inner rabbet joints as well. I dry fit the panels, then mark a line where the brace is so that I know where to put a bead of glue.
Then I glue on just one side panel. You could glue both on, but it's easier to glue one, and then glue the inner baffle on the box. If you glue both sides on first, then the inner baffle has to drop into the rabbets, which is messier with the glue.
So after one side panel is done, I glue on the inner baffle. It lines up nice and easy. Now I'll glue on the other side panel. At this point the box is complete except for the outer baffle.
If you're worried about lining up the second baffle while gluing, you could always go ahead and drill your screw holes for the waveguide and woofer through both layers. Then, when you're actually gluing the baffle on, simply put the screws in so everything lines up okay. Then clamp it the rest of the way.