Might be worth while knocking a trolley together so you can rest the whole lot on it and pull it back in a oner? Depends how many hands you have to help I suppose?
I manage without a trolley or any helping hands, in fact i'll be doing one later today
two long dowel studs screwed into the engine block to slide the box on, a hammer, which i stand up to help support the final drive, then lift the box/swingarm/final drive up and slide the box in place, two rear wheel studs in the wheel flange, turn them by hand and the clutch splines locate, then bolt the the box down.
Then slide the clutch pushrod into place.