Attached is a
PHRF-NB form from 2014 - the final year I owned Rhapsody. It has most everything you need. If you look on the J/30 website menu you can mouse over Info and click on Official Specifications. There is additional information in the class rules available if you mouse over Class then click on By-laws, Rules & Specifications.
Sail dimensions should come from your sail maker.
Edit: ps look at
World Sailing Equipment Rules of Sailing ("ERS") for definitions of the measurements