What's the value: 1977 Bus with large sliding sunroof, Westphalia equip.

I'm thinking of selling my 1977 Bus and would like to get an idea of it's value. It has
the large metal sliding sunroof and I bought Westphalia insides from a camper and
installed them (bed, cabinets, sink stove). The sink and stove are not hooked up
electrically but the transformer is in place(under the rear seat). Low milleage rebuilt
engine.

John