Bathroom Renovation - Moving around tub and toilet

We currently live in a standard alcove studio and are thinking of converting to a jr-1. The only problem is, that conversion would seal off the entrance to the bathroom and we would need to walk through the "bedroom" to get the bathroom each time. To remedy this, we're thinking of creating a new door to the bathroom from the living room side (and sealing off the old one), but now we have a new problem - the wall that faces the living room, and where the new door would be created, is the side that has a tub. Fun. Is it relatively easy to switch the position of your tub and toilet (I figured the answer is no)? If so, anyone familiar with any plummer/remodeler/contractor that would be good with this kinds of stuff and at what price range? Thanks!