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True, since the total weight won't be enough to deform the bearing inner race....
Don't forget you still want some kind of large washer/shield placed on each side of the hub, to keep dirt out. That shield could either be pressed into the sleeve, next to the bearing, resting against the outer...
Yes, your hub needs to be sleeved in any case and bearings should fit snugly (pressed-in by hand).
What are you planning to use as spindle? Because that's what really determines the bearing size. Any single-deep groove ball bearing with a I.D. of 50-55mm and O.D. 80-100mm will work for this...