Motorcycle and Scooter appreciation

Saw one of those Dingos on Ebay recently, it looked lovely. There are a few different models with varying good looks. I'm pretty sure there are large potential risks once the batteries get larger and the voltage increases but the kits are bound to improve in power and reduced battery size.

This one looks interesting, coming from the pedal operated motor side but does 50mph and needs a motorbike licence. Will be worth remembering to keep the pedal up on the low side when cornering at 50mph!

https://www.motorcyclenews.com/news/2019/june/pedal-hybrid-motorcycle/

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.