Yeah batteries seem to be the costly part, and as someone pointed out on another forum a couple of years ago they've no way of disposing of old batteries yet.
Oh no there absolutely is. You don't dispose of them you recycle them. Big plant in Germany can recover something like 98% of the materials.
Jonny Smith reviewed one recently which he was very upbeat about but it was something like 14k to convert and get 160 mile range. I think they did as good a job as possible but it just proves that its probably not the best idea..
I'd say that sort of thing will happen a lot more, it'll end up being like putting an 1.8T or TDi into a Mk2 Golf etc 15 years ago.Neighbour did a tesla conversion on a vehicle. Wasn't a classic but I'd imagine same logic will apply, was nothing to do with being green, saving CO2, saving on fuel etc etc. It was simply because he could and had the means and skill to do so for the craic.
Personally I just don't see the point. Are you future proofing your classic or just doing it because its an itch to scratch? It's insane money to do it to a decent specification. I can see it now when folks in their home garages really start to get involved. There will be garages burnt to the ground on a weekly basis. It's dangerous enough stuff to be messing around with and when the batteries go up in smoke, they don't go out, no matter how much you try to extinguish them.
Leave it to the modern era and let the old stuff live out their twilight years gracefully.
All I can think here is, congratulations, you built a mk1 tesla, but worse