How strange! After mentioning in my opening post that he's not posted in over a year - another update! It shows the full conversion. Hopefully the wait for seeing it on the road won't be so long now!! https://www.youtube.com/watch?v=x_UvJRzdXxs

Absolutely! It would make it go really rather well with the extra torque! The gearboxes on Smart cars aren't too bad, other than taking an age to change (electric auto changes), but as it would drive in just the one gear I don't expect that would be such a problem. The main problem would be space for battery packs - there's a small amount in the boot and more space under the bonnet. What battery packs are you using for your conversion?

Thanks for that! This is the rear subframe of the chap who has done a conversion already - using the original gearbox. I see the motor you mentioned has the same dimensions as the Hyper 9. My old ICE Roadster had the same power (120 bhp) through a remap. I don't know much about these things, but it looks a nice tidy solution - the subframe is very easy to drop, as seen in this picture.