Thats a great price for those components. I wasn't aware that agri-supply houses carried delrin bearings. I have a set of Cat-Trax I purchased for about $300. Best 300 I've spent. I have also researched building my own but any components to build it cheaper were not the same. I would think that for $75 you could put something together but it would not be the SAME materials as the marketed wheels. But as I am the eternal optimist I guess it is possible. We'll be looking for your wheels to be available soon on the Catsailor.com website for sale at $150 or so.

Good luck,
Clayton