Just be wary of adding too many speakers, more is not better in a properley setup environment. You say you plan to do 7.1.4 in the end so adding two rear speakers, but rear speakers only work well if you have a few feet at least between them and your listening position. If you don't have enough space don't add more, a properley setup 5.1 system will sound better than a poorly setup 7.1 one.
Otherwise sounds glorious
I still say 16:9 - all IMAX content is 16:9 and you appreciate the size much more then. You have a decent projector so black levels won't be a problem for the borders. Yes 2.35:1 is very cinematic but you will be annoyed at the 16:9 scenes or any shows you watch due to the smaller screen size
Otherwise sounds glorious

I still say 16:9 - all IMAX content is 16:9 and you appreciate the size much more then. You have a decent projector so black levels won't be a problem for the borders. Yes 2.35:1 is very cinematic but you will be annoyed at the 16:9 scenes or any shows you watch due to the smaller screen size

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