Dominick,
I have always wondered if a Porsche Tipr would work some how in the midengine position. I assume the ring gear would have to be flipped to the other side of the pinion, but I have no idea if this is even possible, let alone, how difficult it might or might not be to accomplish if it is possible. The Audi actually uses an inline transaxle for front wheel drive, doesn't it? That would certainly make an Audi automatic a candidate. This shows that, at least, it can be done. I feel quite sure that neither flipping it upside down or reversing the engine rotation are options for an automatic transaxle, so ring gear manipulation is about the only way I can think of doing it.
Were there any automatic 914s? I know there are automatic Boxters, but the issue there would be the computer control. This might limit one to a complete boxter drive train, or a lot of research and customizations to provide the proper inputs to the transaxles management system so that it operated in an acceptable fashion.
The other options would probably include many of the front wheel drive setups. This would include mid engine cars that use front wheel drive transaxles (read transverse) like the Toyota MR2 and Fiero. The Cadillac Northstar front wheel drive setup would be worth consideration as well. I've seen this used in a Lambo before.
Lynn