Travis was able to simulate Versa Tubes using 2 extra projectors he had laying around combined with home-made screens made from PVC pipe. Check out the effect in this video:
To create a single image with 2 projectors, they used ProPresenter with the Matrox TripleHead2Go. The Matrox allowed them to split one signal to 3 different projectors. The tubes were created from 2″ PVC pipe into 3′ sections. Then, a 1/2″ hole was drilled on each side of the PVC and hung with a chain from the ceiling. Pretty cool effect, eh? Check out Travis’ blog post for a few more details and pics.