I can think of three major versions:
1. Max Occupancy, where the Cabover contains big sleeping cushions. Ours is like that so it's rated "Sleeps Eight." Tow persons in Rear Queen Bed, In Cabover, Two in Dinette, Two on Foldout Sofa. Good luck with the last two, but small to midsize kids will fit.
2. Entertainment Center, sounds like what you're describing, with a TV as the centerpiece and cabinet doors to the sides. And you're right, difficult to reach all the space. Some have a slideout berth for one person. I like that style.
3. The so-called "B-Plus" which doesn't have the big cabover, just a fairing from the low, narrow van cab, blending into the higher, wider, Class C "house." There's nothing "B" about them. A Class B RV is built within the metal confines of a VAN. Maybe a van with a raised roof. But a Class C means an RV "house" on a cutaway van chassis.
Call them what you will the "B+" can be a very nice Class C for small groups, like a couple. That's what we started looking for, but we went traditional C when we looked at floor plan and storage. The "B+" tends to be shorter, lower, and sometimes narrower, than the traditional and entertainment center versions.
There are many variations, all useful, none perfect. Naturally, engineering and quality are very important, but Who will Use it and How should be your prime considerations. If it has great design and assembly but rejects your lifestyle. what good is it?
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB