Different strokes for different folks! I have size 14 feet and you've seen my crazy-packed board (it's all placed carefully and I personally have no issues after a little over 4 years using the same case). It is funny to see other peeps run their instruments through my board as some do have fun trying to get it right.
I've got size 15s myself, it does get a little tricky for me, I need to space things out a bit.
I don't think I could play that 12 step with my feet at all, haha.
