I think a two stroke, in frame HT/China girl would require some fab work.
The HS 49cc four stroke may be an easier fit because the engine mounts differently.
I think the Townie makes a great ebike because you can mount a lot of batteries in that frame triangle.
Of course, all the rack mount engine kits should work too.
cool thanks.i plan on doing this in the next month and im totally new to this sort of thing.i watched a youtube vid on engine installation and it looks fairly simple.cant wait!thanks again