I don’t stick my head out of the roof that often but I would stick a 2x4 through the rear window opening if I was going for R1T. Neither are would be a deal breaker for me though. As of now, R1S makes a bit more sense for my case (not a whole lot more).Same case could be made for the roof yet Rivian chose to stick with a fixed glass panel. Not sure if they made these decisions trying to keep things simple for startup or if maybe there were NVH considerations.
It all boils down to Rivian's motivation for going with a fixed back glass and roof. If they were trying to keep things simple at startup, then obviously these aren't options they would have considered.How about a removable rear window similar to the C3 corvette? Or one that folds up like many SUVs (preferably power / automated)?