Hah, that is brilliant!
I guess you can just take the guts out of the pumpkin to reduce weight/drag
What are doing about the driver-facing parts of the Prius? Speedo, economy display, pedal cluster, ignition, etc? I assume you're keeping the stock wiring loom intact so the ECM still thinks it's a Prius
. You and Bill are going to have to get together and drag race!