I have barely started on my travel 8" project, but I am hoping to complete it with a drill as my only power tool, with no jigsaw or router. The trick is to find already formed circles for the alt bearings. My wife had an old round CD case that she was going to put on craigslist for free, so I grabbed it. The top and bottom were 3/8" particleboard circles of basically the size I needed. I sanded one side of each circle, glued them together with Titebond II (clamping with five tiers of bricks), and then cut the resulting 3/4" circle in half with a hand saw. Another source of wooden circles would be small round tables that one can find on craigslist for $10-20, or maybe even for free if one waits long enough.