Thank you everyone for the great feedback.
There is one thing I would like to ask the community about the plate mounting method. In the prototype the plate is still top mounted. A gasket mount would need a solid back piece. Right now, the keyboard has a nice heft but a back piece would send the weight off the rails.
Our idea is to use nitrile washers around the eight mounting points to decouple the plate.
Would it be fair to call this solution a gasket mount? Mechanically it should behave the same as a regular gasket mount and be more customizable.