Mini Rokon project

I’m turning a SSR 110 into sort of a mini Rokon with a front hub motor and a few other modifications. I’ll be extending the frame to be able to carry two people more comfortably but what I was wondering is what kind of suspension should I get to compensate for this? Most of the time I will be riding alone, but I’d also like it to be comfortable for a passenger. Any advice on what weight of rear shock or mods to the front forks? Additionally I’m trying to mount some 21x7-10 atv tires but I have no idea where to start and don’t want to have to drop the money for a BVC big wheel kit.
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