Tony Tegheim at Mooseville Performance in Sweden is building a custom tube chassis Volvo 142 with a Mazda four-rotor engine. This guy sure knows his way around rotary engines. For proof check out the build gallery or the 37 page build thread. You really need to go through most of the pages to get a sense of how much work is going into this project.
Source: RX7 Club via Build-Threads