Honestly never even heard of them myself until i saw this thread, and from looking them up, only thing available on the DLS is an engine spec for them. Azervich did build one a few years ago, but due to getting stuck on it after being unable to get the research he needed, it was never released.
Once i get enough experience with Blender/FreeCAD and such, i might get around to modeling one, but that's going to be a long while from now...
-Chiro