Adire sez I should get the Tempest Real Soon Now (have the shipping info via e-mail - I like those guys...). Gonna go pick out some tube - I'm going to try to find it close to 23 3/4" in inside diameter, since the pre-cut circles at Home Despot are that size, and give it a liberal application of cement. The circles are going to screwed and glued to a 27" square piece of 3/4" MDF for top and bottom. So, since we've gotta buy 12' of the stuff, we're also going to experiment with several different sizes of enclosures. What's the best way to get a good square cut on it? And how do you guys suggest "sealing" the edges?