Cool, I like the Esprit/Cortina idea.
I didn't know the Focus 4.6 V8 had been done, but I figured it was only a matter of time before it was. I think the 5.0 has ended up in more chassis than just about any other engine, and sooner or later the 4.6 will likely catch up.
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2004 Subaru Impreza WRX STI (daily driver)

1999 Mazda Miata (track car, slow, but finished the SCCA Runoffs)
1987 Porsche 944 (being rebuilt)