thank you VERY much Ted- have already emailed them!!Eianm: This company may be able to help you with a soundproof cover for your generator.
http://stopthesound.com/generator-soundproofing/soft-generator-cover/
I am not sure of your engine design, but many pre 2006 Yanmar engines did not have an intake silencer installed on the engine. The result is huge amounts of BASS being dumped into the boat from the intake pulses. On my 2004 I installed a 4 foot coil of SOFT wire reinforced carpet cleaner hose 1.5 inch, to the intake manifold with some standard plumbing connectors. The result was tremendous. Before the change, you could not have a conversation in the saloon, if you were motoring. Now conversations happen all the time. $20 fix. I installed this 700 hours ago, and it has not effected the engine or performance at all.I hope you can find someone making them. If you do, please post here. I would like to contact them about maybe doing some work on my Yanmar 3GM30F. While motoring down to Florida, it is louder than we would like in the saloon.