Meditation hall/performance space

Finally I got the slab poured for a barn-like building that would serve both as a Zen-style meditation hall, and as a music/theatre stage, opening onto the grass. I found four 8' tall glass panel doors at Clark's, the local scrap yard, and with a couple more that I will make, they should slide aside to open the stage. I'm trying to figure out a simple post and beam construction method, with a Bhutanese style double roof, indirect light up top, and an 'agricultural' metal roof.