That looks lovely!
I do belive by law the rear tyre cannot be the furthest part back and you'd have to fit something (that may completely ruin the lines) to make sure it wasn't. Have a look at a rear splash guard on a
BMW 1200 GS for ideas.
Forks you can either go road based (GSXR etc) but that would make front wheel choice difficult. maybe half and half like the Versys front forks or just graft in full M Cross forks and use a motorcross front wheel. Lots less trouble.
That looks like a GSXR 600 K1-k3 rear swing arm you've used and that might just fit. I know if you reshim the pivot point it'll fit into the frame but can't advise on whether it would foul the rear exhaust and whether the suspension mounts would line up or need moving.
Good Luck! It'll look great when its finished!
C