What they should do is put a floating preview window in the modeling room, like they have in the texture room, showing how it is interacting with the other bits and pieces. Other than that I agree. It is annoying sometimes havine to pop back and forth between the model and assembly rooms. But I wouldnt want to have to try and work on the object in the assembly area, that would get way too confusing. It would also help if you could bring more than one object at a time into the model room. Like the cockpit and canopy of an aircraft to make sure you get the best fit possible.