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Insulate the walls, (tight packed or loose packed)
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Loose. The tighter you pack the space the more easily sound can move through. But remember that there's only so much you can do with insulation and drywall layers. If you're
really serious about sound control you'll need to consider double walls with staggered studs. Basically a room within a room. Also note that you need to go all the way - the weakest link will allow sound to seep through and ruin your efforts. All that said insulation is better then nothing but don't expect a totally isolated room.
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5/8" plywood, resiliant channel, 5/8 gyproc for wall construction.
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I don't think I've heard of that before. Typically the layers of plywood and/or drywall are mounted to the reslient channel which is in turn mounted to the studs (make damn sure you don't punch through the channel and connect the whole thing). Ideally the layers should be of different thickness as they will resonate differently. Also remember to overlap the seams of each layer, use acoustic caulking between, and screw instead of nail.
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Carpet on floor and half the wall, then 2 difusers made from 2 x 4 each side of the window and same on the other...
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Plan for acoustic treatment with absorption behind the speakers and at the points of first reflection. Diffusion is effective above, beside, and behind. Be careful with too much absorption as the room can become dead which is not a natural listening environment. Likewise watch the blanket application of carpet up half the wall. Then you'll have dead down low and lively up high.
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4 wall sconces for the lighting....grey for the ceiling....black curtians for the front with screen.
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Good call for gray ceiling, black around the screen. For lighting whether or not the sconces will be enough will depend on the room. Make sure you can control the light (you mentioned a window - use blackout shades). Make sure no light shines on the screen. Consult with a lighting expert for a good combination of ambient, accent, and task lights to really make your theater stand out. If you're building a riser for second row of seats plan for rope lighting under the edge (for steps as well) for safety. Also looks cool as hell.
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Small stage to place speakers and sub...
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Make sure you allow for enough room for those speakers. Map it in advance. The speakers should be out from the walls with room to breath. The stage should be solid as a rock by following the directions located here and elsewhere on the web.
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Discrete power source for components...8 guage wire from the pannel. the rest on anohter circut.
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Good call on discrete power, but as above I think 8ga is overkill. 12 is all that I've ever read is necessary for a 20A circuit. Make sure there is no lighting on this circuit. Make sure the electrical and audio/video runs are not parallel, and if they have to cross do so at 90 degrees.
Have fun.
