Don't know abot Elite, but Draper makes outdoor motorized screens designed for outside and weatherized.

I have done a couple of projects where the screen stays and the projector is moveable. I used a rolling utility cart and strapped the projector to the top. AVR mounted on lower shelf along with streaming media device. I also add a 45 pound weight on the very bottom shelf to make sure the cart doesn't become top heavy.

I've set them up as 2 channel stereo, 5 channel stereo. I've also done with powered speakers and a pre-amp only as well as standard AVR with speakers.