ok no joke, I was at a barbecue hosted by the guy who sculpted this character, he worked for gearbox shortly before leaving to pursue Dota 2 workshop stuff full time.

He worked on this character and for two weeks straight the art director kept coming back, again and again asking to make his head a little smaller and his body a little bigger.
Montana supposedly looked pretty normal at first but eventually evolved into what we see now.

This is one of my favourite stories from TI6
He still has the sculpt on his portfolio solely as a conversation starter

honestly the saddest part of this story is that the dude quit gearbox to work on dota 2 workshop stuff, because evidently making free shit for valve on the off chance that they MIGHT pay you pays better than working for gearbox 

He got a skin in CS:GO and then used the money to buy a HOUSE

He actually works for Arena Net now, so it all works out in the end.