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Since the frame around the driver is most likely to be 2" x 2" x 1/4"-wall square steel tubing, and that's common for ball-mounts into class 3-class 4 hitch receivers, the whole passenger bit would sandwich between the driver's seat and the drivetrain. So yes, the wheelbase would get extended. Or shortened, as the case may be.
But it is also adding an extension to the shifter, the brake line, the E-brake cable, the wire harness for lights and turn signals if nothing else, and possibly the radiator hoses. The frame itself wouldn't take half an hour, it's these other extensions, or deletions as the case may be, that would take the time. Quick-disconnects for most of them already exist, or there's something adequate that should be adaptable. I'm known for how I re-purpose things for unintended uses with great success.
The real issue seems to be mating 2 canopy sections smoothly, so the aero works equally well both ways.
The single seater should be a fun toy, but it seems difficult to justify. The second seat adds some eco, but will dramatically change the way the whole thing works when trying to have fun.
I like this, if it can be done at a racetrack parking lot by one person, rather than just in a home garage with a helper. I'm thinking a small onboard air compressor, and a vertical, retracting pneumatic landing foot at the front of the drivetrain, probably a second at the rear of the front portion.
Then the section removed can be locked to the trailer with the street tires while racing on the race tires that necessitate the small trailer.
Eco doesn't matter if it isn't fun. But fun isn't fun if you can't afford it. And this also needs to showcase my skills to attract paying customers, same as the RX-7 build I'm nearing the completion of. And it needs to stay under $5,000 not counting my labor.
I'd prefer to sell the design for 2 million rather than selling copies at $10,000, but whatever.
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