Sorry I haven't responded earlier. I have other projects on the go.
Like I said before it's highly unlikely you'll find an "oweners manual" for your power boat
like the owners manual you get with your car. Boats just aren't produced in large enough numbers for builders to invest the many thousands of dollars in the production of a dedicated owners manual. Higher volume boats possibly such as the Bayliners, Doral's etc. It's different with cars when a production run int he 10's of thousands of identical vehicles dictates the economincs in producing a generic manual for that particular model of car. Boats with production #'s in the 100's it's highly unlikely that a builder
would make that kind of investment.
What you'll usually find, this has been my experience, you'll get a binder or satchel with all the mfgr's documentation
on each piece of equipment
installed on a boat. Such as the OEM maintenance
manual for your engine
and outdrive. For older boats that have passed through a few owners, such as mine, I had to re-assemble my package myself and it took a few years and plenty of research
on the Internet
but I did finanlly find the engine/outdrive manuals
including the shop service
manuals, exploded parts
diagrams & listings, manuals for the head
& pumps etc. I've also replaced a lot of the systems and put the new documentation
into the binder that'll go with the boat when it's sold.
So you might be looking for the "Holy Grail" for Thompson boats but as you mentioned you've contacted them for assistance. IMHO that's your only hope if one even exists.