Brandi and I have spent a lot of time over the last few days sanding on the cabin top. We are working to get the lip on the door frame just right so that the Mcmaster door seal will fit snug on it. We are using super fill (the blue stuff in photos) to smooth out parts of the fiberglass. It fills in little gaps and is very easy to sand so its easy to get a nice paintable smooth surface with it. Its been very tricky trying to figure out exactly how the lip of the door frames should be but I think we are getting there.
Next stop will be to mount our overhead console to the cabin top. We purchased the one from https://aerosportproducts.com and its awesome! It fits great and will look really great when we're finished.