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If you look closely at the pieces in the whole mounting arrangement, you will notice a chunk of heater hose for each.
That is synthetic stuff (urethane I think) that is near bullet proof. I used a piece for each mount to isolate the bolt from
touching any frame metal that would send vibration from the frame to the cab. Should work fine... I hope.
The rectangular pad is the 3 layer stuff I got from my former student. The round piece just below the heater hose chunk
is the lower body mount pad from the suburban body that was originally on this frame. Those were in good shape,
and just happen to fit right over the heater hose piece.The design is a composite of several systems I've seen, and while it
took way too much time to build, it should be a good means of handling the noise and vibration transfer from the frame.
I'll use a similar though smaller setup on the other 4 mounts that will be underneath the main cab.
One pair will be at the rear just behind the door latch post and inboard a few inches.
The other pair will be mounted mid cab and in the same frame location as where the engine mount cradle will be.
That will work to reduce the amount of fabrication a bit by combining the two mounting needs, engine and cab,
onto one crossmember.