The manufacturer, Stockroom Supply, also sells DIY (V-Drum) drum kits. I built one about 11 years ago using their drum kit and a formica top they had at the time.
I followed their plans and it worked as advertised.
There is, however, a caveat. Their Flatmaster (and the DIY version I built) is a surface sander, not a flattening sander. The amount of material taken off (and correspondingly the depth of cut) depends on the pressure you use when passing your material over the spinning drum. You can get a nice smooth surface, but it may not be flat.
I used my V-drum a lot for things like resurfacing cabinet faces, etc. and it was fine, but when I started doing segmented work it proved to be the wrong tool for the job. In segmenting, it is not enough to get a smooth surface ... it has to be flat our you won't get consisten, tight glue joints.
So, depending on what you intend to do with it, the Flatmaster may or may not be the right tool.