Those that distance race in these types of events understand the -pragmatic aspects for safety which is the main reason for a F-20 type class,-basic boat specs defined clearly , and max sail areas per boat weight listed .--
The other aspect for next year should also be complete disclosure by all teams of all modifications to boats one month before the race ,--for example as you noted -reinforced sterns -rudders castings boards ,-a mid pole snuffer , etc.
this way any team could have the opportunity to add any other mod or feature any other team had .
team web sites and pics are very helpfull ,-the intent is to win per rule #2 in ISAF racing rules --as a test of sailing skills on reasonabley equal boats . --not a ratings game or by special modification no one else has.
Racing the 6/0 ""class"" in past W-1000s most know the boats were not equal ,--I-20s have 3 different spin cut variations ,and are reinforced and modified . For distance racing boat prep is a big part of the game ,-often for safety reasons as noted and just to help insure a finish .
Your list is perfect except for being able to also add a main reef system ,--just as the 18 hts had this year ,-would have liked to see some weather when they could use them ,-they would have been very effective and much more controlable .
There should be no problem racing an I-20 with a N-6/0 hull platform or Supercat 20 8.5 beam platform -or Fox platform ,-or Storm ,-or H-20 -or P-19 -or any ISAF recognized 20 with a modified sailplan or same size I-20 sailplan on it .
Were back to basic F-20 rules ,--that need to be limited to production types only as listed for now .
The H-Fox --H-20 --Inter 20 --sc 20 8.5 beam ,--Storm 20 its a U K 20 --N-6/0 --Or any current ISAF CLASS 20 per N A F-20 specs.
Per other posts in the thread and current F-18 racing -these are minor variations between boats and nothing that directly effect skippers ability or race finishes that good boat prep.and practice would not cover.
I recall in the old days a catsailor bringing out a RC 27
to local races ,-he could not start on time ,-could not read shifts ,-was afraid to drive the boat hard ,-and had poor crew work ,--we often beat them around the course on H-18s . --It takes a good team to sail well on any cat .
