I realize that reality often conflicts with wants, but I always enjoyed the open view of a convertable. I wish someone would make a clear glass top for pickups, it could have a retractable interior (silver/chrome) cover to keep out excessive sun if needed.
When traveling in the mountains I miss being able to see over the doors and windshield.
Take out as much roof sheet metal as possible, leaving just enough to support the windshield and above the doors. I suspect our trucks could be moded a bit with a roll bar structure to replace the structural interegity that would be lost.
I wouldn't be suprised if you used shatterproof, bullet proof glass, that it would be stronger with glass, than the current sheetmetal.
RR