Dave, here's some of the answers
I really can't answer the real technical questions. We paid to have the 18 horsepower Westerbeke installed. I had to ask my husband about your more technical questions & he wasn't sure because the yard took care of all that. I do remember that some fiberglass work had to be done to the area that the engine mounts so I am assuming that the Westerbeke is narrower than the yanmar. Also, the new hotwater heater is behind the engine where the batteries used to be and the fuel tank beside that. Ken plans to put the batteries where the old hot water heater was (port side) and the electrical panel and battery switches in the galley wall that separates the galley from the lazerette. I don't know about how thick the shims are but can measure the next time I go down to the boat and let you know. We didn't replace the prop but did replace the shaft, as it was bent. A new shaft was only $50 more than having the bent one straightened. Which explains why the boat vibrated so much when the engine was running. The engine itself was around $6,000. Total cost of installation + new fuel tank, new hotwater heater, replaced all seacocks, new raw water strainer, I'm sure I'm forgetting something, was a little over $13,000. Oh, I feel sick *cry. Now that I think about it that price also included the storage costs for that season. We have a anti siphon loop on the water intake now, didn't before. Sorry, can't answer the performance question yet as the boat is still under reconstruction. We spent the last two years taking the boat apart and are just getting to the put-it-back-together stage. We have removed all deck hardware and filled all the holes with epoxy, we also filled the chainplate holes with epoxy, after reading an article in Sail Magazine, because we had issues with leaks in that area.Everything that we could take apart and take off the boat we did and then we painted the interior. All the wood that we brought home got washed on the deck and when dry got 3 coats of Interlux's rubbed look varnish. Once the hull liner is installed we can put the galley back together. We were going to replace the icebox but it was just too expensive. Then we thought we'd build a new icebox but decided it just wouldn't be worth all the effort when we have so many other things to do. So, now we'll just buy a good cooler. The steel I beam that was in the bilge supporting the compression post was toast so we chiseled it out and have a new beam (cost $20.)that Ken has coated with epoxy. We stripped the yucky grass paper off the bulkheads in the v-berth and head and tried to rewallpaper with vinyl wallpaper. That didn't go so well because we could not order the commercial width(it would have been too expensive and we would have had way to much wallpaper left over) Anyway we used the regular width and a good vinyl paste and the seams opened up over the winter. Sso.... Plan B is to install "formica" product from HOme Depot at a cost of $40. per sheet, will need two sheets.We ripped all the wiring out this summer, what a mess of spagetti *o and will be installing all new wiring, that will be labeled & lights this spring. We took out the water tank and will install new water & holding tank.We ripped up the delaminated sole & will install new. Sanded the lovely lavender non-skid paint from the decks and removed portlights. This spring we will have the boat moved into the shed and paint. We had hoped to paint this summer but there was never an overcast day that it didn't rain. Once we've painted we can install new portlights. We've bought new smoked lexan to replace the cloudy,crazed acrylic in the hatches. And, I'm looking for new upholstery material to replace the lovely 70's plaid that currently covers the cushions.Oh, we ripped the hull liner out and are replacing it with a nice oatmeal colored commercial indoor/outdoor carpeting. A 9x12 piece cost us $113.00. All the other indoor/outdoor colors of carpeting at home depot etc were all too dark we felt. And we are going to take the pedestal to Edson in Massachusets to be refurbished. They are only about a couple hrs drive. We have learned a lot by taking this boat apart and procrastinating in putting it back together has given us time to rethink some of our original plans and discover better products or techniques. Hopefully there won't be any "extra" pieces left over when we're done. We do have pictures of the boat from the survey to use as a reference if we've forgotten where something goes. I've got to get someone to scan those pictures so that I can post a before/after here when we're done. We've learned a lot.