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Sounds a fun project but why not do it on a new(er) Enfield rather than chopping up an old BSA? Cheaper to start with and not taking an old'un out of the gene pool....
My mate's got a 46 B31 (I think) 500 Single and it's a sweet thing. They don't feel anything like newer bikes to ride. The engines are lovely, proper long stroke doffers.
Jung
I desperately want to do an electric conversion build on a classic bike.
Over been looking into it and researching the pros and cons of hub-mounted motors vs mid-mounted motors etc.
There's a fair bit to it from a design perspective in terms of weight distribution, obviously performance isn't a big factor on something like this but it would be nice for it to feel nice and not ride like a pig.
Ideally I'd like a 1940s through to early 1950s donor bike, I've been leaning towards an early to mid-40s BSA M20, they're relatively plentiful.
I reckon using a 500cc bike of that vintage would give decent scope for battery capacity as opposed to a more lightweight 250cc, the frame and suspension would be on the beefier end of things for its time.
Ideally I'd like to get about 12/14kw motor capacity (a little more than an original M20, quite usable I'dimagine) and then obviously as much battery capacity as can be made to look aesthetically correct on the bike. I'd plan to make a sort of art-deco inspired, louvred aluminium casing for the batteries to take the place of the engine and then mount all of controls in the tank.
No idea when I'll get around to doing this but it's definitely on the cards.