I started this--the top part with the pier made of 80/20 Series 15 T-Slot Aluminum beams and angles--about a year ago, or maybe longer. I never really used it though, because I needed some place level to anchor it. Taking some more t-slot beams I made a base for some super-duty castors and bolted an old steel AV Cart cabinet to it. This has become the base for my next set of astro sessions, where I will be wheeling this out to the driveway, leveling it (threaded leveling adjustments on each side), polar aligning, and then we'll see how the astro imaging goes. I'm looking forward to getting more of the western sky, most of which is blocked by the house when I'm shooting from the backyard.