This reminds me that I never posted anything about the thickness sander I built. It works pretty well. I don't have heavy-duty needs, and I didn't want to spend $750. I also enjoy the series of small engineering projects that make up something like that. Kind of like building a fret bender, just a lot more involved. But, yes, it does keep you from doing actual work on guitars while you are making it and isn't for everyone.
I'll try to dig up the old in-process photos - it's very much like what is on that site, but mine"s bigger: 17inch drum, longer table and floor model rather than benchtop