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this is either going to require an insane level of skill for fabrication and welding, or you're going to need very, very deep pockets.
but, yes, you have the right idea. an engine under the back window with the transaxle mounted behind the engine.
that's what MR is.
the difference between an MR format and an S Chassis is that our cars are not designed that way. we have a much longer front end than any MR car, and very limited room between the back of the driver seat and the subframe.
the floor behind the front seats will need to be completely removed, a crossmember built between the frame rails to support the weight of the engine, and a completely custom subframe to house the transaxle (which will be too large to fit under the stock subframe). if you can get that far, you will need to build a functional firewall between the new engine bay and the passenger compartment. You need to really picture how little room there will be for an entire drivetrain in that small space.
like Supa said, please don't ruin another s chassis. unless you happen to have a junker lying around somewhere.
i don't know your welding or fabricating abilities, so i don't want you to think i'm insulting you, but this is not a task for a beginner. these cars have been around for 3 decades and I have never seen a (not completely fucked) MR modification on one. There's probably a reason for that.
best of luck to you.
edit: i just remembered the Porsche 944? was a front engine car with a rear transaxle like the corvettes, but is about as big an S13,S14. Maybe there is a way to use that subframe as a reference, but I think you are going to get in over your head when you try to fit an engine behind the front seats.
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