Matt. I really hate to disappoint you here but the one problem you are likely to have is with your Gemini controller. As a general rule Gemini does not handle working well off a battery supply. It is very voltage critical and often does not handle very small voltage drops well at all.
You may be better to power it off a DC to DC converter which can step the battery supply up to 15 or so voltsfor the Gemini only.
Good luck with it all. You will need a pretty heafty battery to power all the gear you listed above.
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