It couldn't be too tough to make, there's already some nice comfy looking bedroll meshes in the game both rolled and unrolled, the big blue ones. What I'd like is to be able to carry it on my back as an apparel item instead of pushing it away into the inventory as a misc though.
I'll have a poke in the GECK but I svck with it so don't expect anything.
I always loved sleeping in my RobCo bedroll in FO3 especially when the dream mod came along. Ya gotta love someone sneaking up on your in your sleep, robbing you then running off. Nailing the SoB in the back of the head with a 50BMG as he was fleeing was fun too.