I didn't take pics... but I ended up being short on time (as usual) so it went with a last minute dry rub (salt pepper chili garlic paprika), about an hour at room temp, then on a super hot grill (well 600F seems to be the hottest I can get my grill before getting tired of waiting), about 5mn per side for medium-rare. It was absolutely delicious, but really it was all about the beef and the cooking, the rub just brought out the flavor of the beef.
Flap meat is I believe different from skirt although it looks similar - I'm not sure what the difference is or if the names can be used interchangeably.
It's just a bit tough which I really don't mind, and if cut against the grain in tiny slices it's wonderful.