I've watched a lot of Matt's videos and there is always something good to be learned;
https://www.youtube.com/watch?v=C3KX8c3UVo4&t=901s
In the linked video he makes a special mention of
Bensonwood Homes in Walpole and that's kinda cool.
There is also
Habitat Post and Beam out of the Sturbridge area and they too prefab a beautiful home, but you will need to source your own builder.
Be careful about how and where you place foam, ants love to burrow into it.