Strikes me that the most important issue here is that the rules have to be enforced by fellow shooters (not by committees elsewhere ). WFTF rules need to be available on handy laminated sheets. Any deviation from those rules needs to be highlighted on the same sheets. I am not sure how many languages they ought to be translated into but confusion could all too easily spoil the fellowship that such an event should foster.
I _think_ Dieter's post above suggests that the differences between DBS and WFTF rules are listed on their web site?
All the best
BFTA Secretary 2012-2014
CSFTA Secretary 2014-2016