I actually have a full size Cobra mounted in my overhead. Since I don't have the Skyslider, or anything else for that matter, in that area, I thought it would be a great spot. I actually had it "professionally" mounted, though I gotta say, they did a very ****ty job of it and I could have done better myself. I didn't do it myself at the time because it was so soon after my spinal surgery that I just couldn't do it. I'm working on re mounting and cleaning up what they did.
The one problem is you have to get the angle right so you can see it, which means cutting into the headliner at a downward angle. I would suggest using an heavy duty epoxy to put a mounting board onto the inner roof as there really is no cross beam to mount into. Once you do that, you may have to fabricate a mounting bracket, but that shouldn't be to hard.
In all honestly, I don't think it would be that difficult to do. Hell, I even told the "professionals" the best way to do it, but they didn't listen to me. It's mounted in solid, but the angle on mine isn't right nor is the trim ring they built and once I'm back to being able to do that kind of work, I'll redo it to look better.
Here's a shot for ya!