My only input/thoughts would be:
because you are a bigger guy you probably have a bigger appetite? maybe I'm wrong. This would lead to more output.
From my experience (5'9" female with a good apetite :) ) I know i have to get up almost always once in the middle of the night because my pouch is full (from output and gas). Luckily I'm a light sleeper and never really favored sleeping on my stomach. These adjustments are minor in comparisson the the relief/freedom I've reclaimed since my colon was removed due to severe crohn's. Although we ostomates have to adjust and learn to do things differently, I'm ever so thankful to be in control of my life again!!!
Good luck with what ever you decide!
PS a good ostomy nurse will also consider your size and where your waistline is when determining where to place the stoma for optimal comfort/function.