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I'm more than a little puzzled here. You're talking about adding a Stirling engine to the exhaust of a conventional IC engine, but having that drive a generator which (with batteries) drives the wheel motors (or other electric propulsion). Aren't you getting more than a bit Rube Goldbergish? Why not cut out the IC, and have the Stirling drive a generator which extends the range of your plug-in hybrid?
The battery wouldn't even have to be that large, say enough for 5-10 minutes of driving while the SE comes on-line, so you save on weight & cost.
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