I added an overhead console to my vinyl headliner car. It wasnt too bad actually. I did have to engineer a way to support the front of it and ended up getting a second domelight support from a donor car to provide the forward attachment for it. Theres a thread around here somewhere outlining the process.
Did you want it to be functional? If so you have a few things yet to collect. You will need the main O/H console harness and the low fuel relay. You will need to add two additional door switches and they will plug into the harness.
It's a bit of an undertaking but the biggest challenge for you will be finding all the parts. It is a cool feature though