For something like this, a business class laser projector sounds like the right move. I'd look at a benq LK970 which you can still find on benqdirect.com often enough. If not an LK990 is its replacement. You need a lot of lumens. These are 5000-6000 lumens and I'm sure calibration is a non issue for you.
Video: JVC RS4500 135" screen in pure black room no light, htpc nvidia 1080ti.
Audio: Anthem mrx720 running 7.1.4, McIntosh MC-303, MC-152, B&W 802d3 LR, B&W HTM1D3 center, B&W 805d3 surround, B&W 702S2 rear, B&W 706s2 x 4 shelf mounted for atmos, 2 sub arrays both infinite baffle: 4x15 fi audio running on behringer ep4000 + 4x12 fi audio running on 2nd ep4000.