Blimey! What a project!
But, if the Hull, Engine installation, and Engine itself is in good condition and you have the time and dosh, as well as live quite close and you have the skills, then why not have a go.
Having been a Carpenter and Joiner for the past 40ish years and have learned, that on a boat, stay away from as much varnish as is possible, and defiantly don't varnish Oak, Teak etc!
Looks smashing, but it ain't gonna stay that way. These woods have there own natural oils, and you can't varnish oil!
The epoxy route don't tend to work either, it's expensive and I have found that it doesn't last any longer than normal varnish.
The trouble with varnishing wood for its looks, is that, come the day when you have to revarnish, all of the old varnish has to be removed and the wood taken back, past it's oxidized outer layer it's original state
Good old exterior ply, primed, filled and painted, properly, will, in my opinion, outlast any varnished surface on a boat.
Lord, don't i go on!
Best of luck