I was looking over my buddy's newly DAR'd 7 this evening as "an extra set of eyes"
He bought it up with tail and wings built, it all looked just beautiful.
On all the horns, elevator and rudder, you could not fit a long #40 drill bit between any of the tips. (parallel to the spars).
I let him know that IMHO that was inadequate and needed to have at least 1/8th inch clearance.
No one in there right mind would knowingly fly an RV into known Ice, but with these clearances, your body would soon be on ice, thats if any part of you was left.
Heck what about a handful of smaller gravel on a dirt strip knocked up into the hinges.
I would take no chances with a loss of any contol surface travel.