I was inspired by this thread to build a DIY Inside Ride setup. I opted for the wodden version rather than building mine out of aluminum. Nashbar Reduced Radius Rollers worked fine. The rails and feet are made of steel and can be tapped easily. If you google DIY free motion rollers you see the YouTube videos I used as a model for my project.

I opted for the Sportcrafters Roller Resistance unit instead of the Tacx version. No moving parts or belts to replace. I may add a couple Rare Earth magnets to increase the resistance a little. So far I can do any type of workout with the exception of steep hill climbs (95% HR/+-70 Cadence) while running a compact crankset.

It's great to be able to enjoy the benefits of rollers and magnetic resistance at the same time. The last time I was able to ride on the rode I noticed my spin/balance was the best it's ever been. I'm looking forward to utilizing the resistance to prepare for spring.