[cypher]

I do like the name Chester too, it seems to suit him

I agree that if he's happy don't worry too much about an upgrade for now, maybe keep a look out for a suitable bin & move him over if he seems like he'd enjoy more space once he's had a chance to settle.
Side by side bins can be difficult to do & you would have to be very careful to make them escape proof, by the time you buy the bins & figure all that out you'd probably find it easier & cheaper to find a nice cage!