This looks very interesting indeed!. If only it was possible to get one of those 42hp ones (6" by 6" size!), it would make a diesel-powered DIY hybrid possible with stupidly high MPG figures!
No kidding! Where I work, I have access to many types of alluminum extrusion including 2x4's, 1x3's, etc. Even a non-hybrid with that type of construction and this engine could give some pretty amazing FE numbers.
Edit: I want to give credit to Randall at cleanmpg.com for finding this.
Horsepower is how hard you hit the wall, torque is how much of the wall you take with you.
The lubrication and sealing problems of that engine are an order of magnitude higher than a Wankel. There's no way that engine will be practical until physicists synthesize Unobtainium for the vane seals.
Capitalism: The cream rises. Socialism: The scum rises.
I agree with Sludgy. I hate to be so pessimistic, but it seems that there are too many odd shaped areas to effectively seal. This sounds like it has a good power to weight/size ratio but with all that leakage, I wonder how efficient it is or how long it would last between rebuilds.