I would have been called "Punisher" from the get-go.
I've got the comics, T-shirts, I wear all-black quite often, am rather mid height, have a permanent "5 o'clock shadow", and I am stocky but not really big-boned
And to top it all off, my favorite pasttime involves running through the woods, abandoned towns and complexes while trying to shoot people with really big, small, and otherwise unusual guns that fire pelletized paint.
Actually, I think that "nickname" would fit a great many of us paintballers.
But "Punisher's Customs" has a nice ring to it.
(:= If you squint really hard, that looks like Punisher's logo on its side.