Sam, you won't have to show your measurement at the end of May, you won't need it until November when you show up.
You also don't have to weigh on official class scales. I'm sure Rick would help you out, he's been doing all the measuring for our fleet. But as Jeff said, come up to Hyannis and do it, that's where Rick does a lot of it.
Also if you buy new sails get the measurement certificate with them from your sail maker, it saves a lot of time and hassle.