Wise words, thank you!cool, seems like a bunch of easy fixes! I'll give some feedback since I just bought a parker last year and had to go through a lot of what you are dealing with.
leaky roof, let's hope the core is not compromised. But either way probably not a big idea.
Batteries. My PO also did that to me.... crappy costco batteries, but brand new. For house battery they are awful. I bought a new trojan battery for my house battery. Thankfully YOU have plenty of room for new batteries since you have pilothouse. I recommend 2 6V batteries for house for your use.
trim tabs, I'm guessing you will end up replacing the trim tabs with a bigger size for better ride in our chop and then when you do you'll most likely replace with lenco actuators. Easy to do and not terribly expensive. Mine had just been replaced....
New windlass, easy to do, my PO had just replaced it so I got a new one! Couple hundred bucks. And add some chain lol
at some point you'll want to consider adding a bench up top