I just got done building one and so far am pleased with it I thought about trying to go the vfd route but decided it was to expensive and just used step pulleys instead and I actually like it quite well. I have a 7" serrated contact wheel a 2" contact wheel, a slack belt setup and a fixed platen setup. I also incorporated an 8" disk into mine as well. I think I have around 700.00 in mine. I'll try to get some pictures up so you can see it this evening if I can get time