I'm afraid that I can't be of much help. I don't know of any Beck cars getting registered in Mass in the last couple of years but Carey would know. They have to register as a "1957 Porsche 356 Speedster Replica" and there are some hoops to jump through but the rules, and how they are interpreted, keep changing. Sometimes people whistle right through the process and other times there are a few more hurdles - It depends on the Registry office and people you use and whether your car is pan or frame based.
I have attached the process that was still valid, last I knew, for a frame-based car. Some people have deviated from this a bit and still got registered - I'll have to check what recent info I have on it, but see the attachment below.
@essjayarr you would be much better off talking with @chines1 Carey Hines at Beck about what they're going through in helping their customers from Massachusetts. It has become a bit involved for frame based cars.
email: carey@beckspeedster.com
Work Phone: (574) 546-4656
I'm over near Worcester, used to register mine as a 1969 VW convertible using the original VW VIN # but 5 years ago I converted to a pan-based replica registration. The registration and inspection process wasn't too bad, just time consuming but I don't know how much of that process is applicable to you.
What I DO know, is that if your engine was built before 2007 (and you can document that), the entire process is much easier.