I'd like to let another player help me build maps. To give you a use-case scenario, we've got a multi-level ship the players use as a base and they're about to upgrade it. I've got a lot to do already and wanted to let him dress up some of the levels with scene items. What's the best way to do this? I see that I can promote him to GM, though if I do that I assume he'll be able to see all my GM maps, notes, handouts, etc. That's not necessarily a problem since I can ask him to steer clear of everything besides the ship. It'd be nicer if I had a way to give him permissions to the map layer on a map I've already made, though. Can I do this? Also, I'd like him to be able to access the tokens and tile sets I've bought, plus the stuff I've put in my library. Is that even possible?