Looks like www.fusionlighting.com has the solution to the light source question! If they're far enough along to get to the production stage???
Super bright electrodeless sulfer/argon filled quartz spheres excited by radio frequency. They say a golfball sized 'bulb' is as bright as 100 100W bulbs!?! WOW, and lasts at least 10K hours!!
No fan. No light leakage. Tiny, and super bright. Mate that to 3-5 system's 1200x1920 3-chip RGB microdisplay solution, and you'll have everything everyone ever wanted!!