Would a gas range extender conversion still be serviceable after the company folded?

Buzz around the bankruptcy is a bit off actually. It was an engineering outfit, not a conversion shop. They built a couple of prototypes to show off a range extender system, picked Teslas because they were easy to tear apart, and the business model was licensing the tech to automakers. Barely any customers ever had engines dropped into their personal cars. So for the OP's situation, the real answer is probably: this was never something you could have bought anyway. That said, the orphaned-vehicle question is real and worth answering for anyone tempted by this kind of conversion later. I put a gas drivetrain into an old Miata years ago, so I know how these projects age. The truth is a regular shop can ussually work on a custom build, but they bill it as diagnostic time and charge accordingly, because nothing is documented. When the company that did the install vanishes, the wiring diagrams, hose routing, and mounts only exist in their files. A good independent mechanic will touch it if you hand them a full folder of photos and records. Without that, most will politely pass, and you end up hunting for a fabricator who does kit cars or.ls swaps.

Tesla warranty is gone the moment anyone cuts into the car structurally, that's a given. Worse, Tesla has been known to refuse service entirely on heavily modified cars, so even battery concerns outside the crash structure can get you turned away. You're banking on independent EV shops, which do exist but aren't everywhere.

Insurance is the part people underestimate. Some carriers will quote a modified vehicle if you disclose it and can show the work was done properly. Plenty won't, and a few will quietly deny a claim after a fire because a fuel line was routed through a compartment designed for high voltage cables. Since your wife's actual problem is just a long commute, you'd get most of the same peace of mind from a used hybrid or a level 2 charger at her workplace, without any of this hanging over you.

Bought a van years ago that some outfit had converted to run propane, then they folded a while later. Biggest headache wasn't the mechanical stuff, it was the oddball parts. Tank fitting, regulator, the little specific bits, all from a company that no longer existed. Ended up scrounging forums and adapting a generic setup that mostly matched. Took months. So yeah, even if a shop will work on a one-off, the parts chain dying with the company is the part that kills you.

On the commute thing, I just put a charger in my garage and stopped worrying about range entirely. Solved it cheaper than any engine swap ever coud.

I swapped a diesel into an old Jeep pickup back in the day, and the thing that saved my sanity later was a cheap label maker. Every wire, every hose, every bracket got a tag before the body panels went back on. Two years afterward when a fuel line chafed through, I had a mechanic fix it in an afternoon because everything was labeled and I kept a spiral notebook with photos at each stage. That notebook cost me nothing and it's the only reason anyone would touch the truck now. If anyone here is considering a conversion, whatever shop does it, demand the notes and photos before you hand over the last payment.

Update: mystery mostly solved. Turns out that outfit was building prototypes to license the tech to carmakers, not doing customer conversions, so nobody actually owns one of these and my warranty panic was pointless. Still, the propane van story about scrounging for parts from a dead company stuck with me. Decided to skip the whole idea and just figure out charging for the longer commute instead.