Now the fun begins sanding, sanding and more sanding

To anwser a few questions
1. the weight is going to be 20-25 pounds finished?
2. the cost I don't know til it's done (so far it's cheap, bit of materials & lots of time)
3. the window will be in the finished piece (easier to mold then cut out the window)
4. the tail gate gap is kinda stumping me still. to small and tight fitting for me to mold one ( I was thinking of a rubber gasket with a curved edge ( would fill the gap & you could open the gate without opening the trunk)
5. the extra lights could go on top as the strip across the top is 2.5" and the fiberglass is going to be 1/4" or thicker
For window options all I got so far is flat glass(black rubber gasket), sun roof ( open at the bottom in this case) or a sliding window ( aluminum frame)
Thanks for the ideas/input keep'm coming & the question ( keeps me thinking)
Steve