Hi JM,
Have you owned, worked on boats before?
The extra primary winches in the cockpit are a nice addition if you're going to fly a spinnaker.
It's curious that the use of rod rigging eliminated the need for a forward lower shroud. I'd be interested in knowing more about the physics of that.
Leaks can lead to a lot of required reconstruction. The forward dorade box is often raw plywood inside and if it hasn't been sealed, is one source of deck sponge. The portlights are probably due for rebuilding or replacing, and rebedding. If it's gone too long, the interior paneling of the coach top (correct term?) could be shot. In the ad photos I see quite a bit of discoloration adjacent to the heater, and some evident in the v-berth.
I didn't see much on electronics in the ad. Looks like it's mostly set up for racing. Is there a chartplotter that will meet your needs? If you need to upgrade electronics, parts could be $5K+ and another $5K+ for installation.
Deferred maintenance can be a time/money suck. We really really like our 35-3, but if I had it to do over, I'd have spent more and got something more turnkey.
There are a number of 35-3 owners active here who will be happy to address model specific questions. We could dig up the prices for what we spent for some of the major projects. And there are many more Ericson owners here with deep knowledge of the breed. Good luck!
Cheers,
Jeff