Working on it as time permits, but 'ultimate' is dependent on a number of factors with the end user's hearing being the most dominant and the one variable that nobody but the individual can determine, so all I can do is recommend big enough to allow the drivers to 'breathe' and you to have some [EQ], port tuning flexibility to hopefully find your own 'ultimate' in room response or at least obviously better overall than any Altec PA/consumer speaker ever offered for sale.
The first thing I noticed about your room though is the left side door precludes doing a simple triangular cab, so will need mirror image builds.
Also, is that a suspended ceiling?
Still ideally need seated ear height since horns beam enough in the HF to have very narrow 'sweet spots', making vertical location a bit 'tricky' best best overall results.
GM
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