Mason and Hamlin makes a very thick rim. Their rim, has two parts as well, and inner and an outer rim. They source their wood locally from what I was told with the Maple come from either western or central Massachusetts, or somewhere in New Hampshire. Their soundboards come from Connecticut, I think, and are Eastern Spruce which is related to the Bavarian Spruce genetically.
I am lucky that I have had the opportunity to visit the factory during the Piano World tours. The factory is only about 2.5 miles (4 km) from where I live in Haverhill, MA. Their construction methods are very automated today with parts mass-produced using CNC machines. They also do a lot of things now that they did not do before when they first started up operations such as using a thick laminate on the rim that is bent and even has cracks. The maple laminate strips are made at the factory by plaining down planks on giant sanding machines. Once each strip is the right thickness, they are then laminated together using epoxy. The thicker strips are bent around metal forms and clamped into place. While this is done in a warm and humid environment, the wood isn't that flexible and cracks and splits. The splinters are cut off and the wood is sanded. There are all kinds of voids in the rim that are filled in with epoxy later on during the finishing process. This is totally unlike what was done when they first started operations. Back then they took their time, and the rim didn't have splits in it from what I remember.
What is interesting, however, is when they first started up operation again in Haverhill the shop foreman and some engineers visited my piano teacher who just passed away this year. (1920-2021). She owned a 1905 M&H AA that was owned by the Mason family. She taught the Mason kids and was given one of their pianos.
One day, she got a call, and the engineers and foreman came over to measure her piano. She was all excited when they visited and called me up afterwards to tell me how they used measuring tools to check out her piano. Sadly, after she passed away the piano went somewhere probably to be scrapped. Her family were totally uncaring and pushed her and the piano to the side. To be honest, the instrument was at that stage anyway and well beyond that point where anything could be done to it to make it more than a badly abused piano. The piano was worn out completely having been used continuously as a teaching instrument from 1945 until 2015.
As far as sound goes, I'm not impressed with the new Mason and Hamlin pianos. They lack that warm yet clear tone that they were known for. Their earlier production is far different than the current ones and the modern process along with some design changes has completely altered the character of the pianos.
When I was piano hunting 16 years ago (Yike!), I tried various Yamaha, Kawai, and European pianos within my budget and space. I settled for a Vogel 177T This is a parlor-sized grand that has that clear tone that I favor. Unlike the Kawai and Yamahas of the same size, this piano was never harsh and brassy which I found common especially with the Yamaha instruments.