Mmm, the thought did cross my mind. I remember seeing a photo of one in an Ameritage (the tiki one I think?) and it fit great. I am just way too lazy to lug it in a case that heavy. I used an Ameritage for traveling and once I got the Kamoa I never used it again. The Crossrock even feels cumbersome to me in comparison to the Kamoa - due to the lack of backpack straps. So I made the cushion this morning (sewed some foam into fleece) and it fits great now.
But I know you are right though. If I kept it in a case at home that is absolutely the one I would use. And I might still consider one down the road for local stuff (classes or kanikapila). But I travel about every six weeks and love the fiberglass for that.
I think ukes are not as delicate as people make them out. I've dropped my MBU in case from the back of a SUV and left it in the trunk for a couple of hours in 85* weather and nothing happened so far. The finish Chuck uses is pretty strong as I've hit the uke on the edge of the table and no dings so far. My other ukes gets dings without me realizing how I got them. I'm pretty careless but at home, any case seems fine in my opinion...most of the time its on the couch / seat of where I played last.