Hi Eric
Rick at New England Catamarans in Mass. has done a number of spin conversions ,-You may contact him for parts and set up ,--also most all sail makers ,--Calvert ,--Smyth ,--Elliot ,-several others have ready made packages.
One thing we will try to do soon is list suppliers parts etc .
Also a number of sailors have additional spin and jibs for sale at half price ,-we will try to help organize a ready list ,along with Rick here on catsailor ,-they are opening a web storefront soon .
If you would when set up please write an article about the modifications and set up on the 20 along with photos .
We need these by good knowledgable cat sailors on each type of 20 ,--Thanks Eric
{your pic did not turn out , has to be under certain # to show ,--try another }
specs from a number of 20s , are also listed on pages 5 and 6 here ,some with profile diagrams -