Hello Mark.
I'm happy with the sound level now, it will be even lower when the boat is in the water. I do have to keep an eye the weight from now on, so I can't consider any more sound deadening materials.
I discovered today that the left side shaft assembly had stiffened slightly causing a drop in max rpm and build up of heat at the shaft tube outboard end and at the P bracket shaft tube, really quite worrying. I found that the overall alignment had changed since it was last checked to. I had to remove the P bracket which was bonded in with epoxy resin, ( and quite a goodly amount ), + 6 x M1.6 s/s nuts and bolts through the bracket, bottom planking, inside reinforcement and brass plate, what a job that was !! Anyway, it's all fixed now. I think the change in the weather may have caused it. After comparing the full speed of the two motors now, they are within 25 RPM of each other, 12300 right and 12275 left. Very happy with that.
As for the seats, the basic core is done for both and red piping is made, it's the cushioning and vinyl covering where I'm struggling. No doubt I'll get there, eventually.
Mike.