Buying 54' Donzi

Hi all, new here and this is my first topic. Forgive me if I don't post it correctly.

I'm in currently in the process of buying a 1994 54' Donzi and wondering what info is out there. I see lots of posts about 65's but nothing on the 54's. The boat is on the west coast, in fabulous condition and I'll be taking to Alaska where it will be home ported in Ketchikan and used for salmon and halibut fishing and cruising the inside passage. My last boat there wasa Sea Ray 390 which I really liked but this is obviously a huge step up.
The Donzi has low hour12v92 DDEC engines, a 20kw gen and an 8 kw gen. The interior was completely redone in 2005 and I love it. New electronics (Furuno NavNet) in 2005 and tons of custom upgrades.
I sea trial the boat in a few days so wondering if anyone can give me any particular issue I should be on the look out for with this make/model.
Any input is appreciated.

Thanks. Yes, full surveys and oil analysis will be done. Was looking more for something specific with the Donzi if I needed to be on the look out for something.

Thanks all. Appreciate the input. Hope to be back on here in a few weeks as a Donzi owner.

Yeah an 80' or even 70' is way too big for me, not to mention beyond my budget. To be honest, the 54' Donzi is bigger than I was looking. I do a lot of slow speed, very near shore salmon trolling so was looking more in the 40' - 45' range when the opportunity on the Donzi fell in my lap. It's pretty heavy, has a draft of 4'4" and pretty large rudders so I'm hoping it will handle reasonably well when slow trolling in some wind and current. It does not have a tower so that's a plus for me.
I love everything about this boat although given my choice I'd prefer it to have 4-stroke diesels vs. the 12v92's but everything I have been able to find says these are good engines if well cared for. I don't tournament fish or have any need to push the boat hard so hopefully with gentle use I'll get some hours out of them.

I had planned to install a diesel fired hydronic heat system as I assumed the HVAC is a typical reverse cycle system. I know from past the reverse cycle units do not do very well in cold water as a heat source. Are you saying this system is not a reverse cycle system? I don't know what you mean by a "chiller" system. Please elaborate.

Wow, that's awesome. You likely just saved me a pile of money on an unneccsary additional heataing sysytem. Do you know how the system heats the closed loop fluids? I assume it is via electrical heating elements? I wonder if there is any way to tie the loop into the main engines to use waste heat?

I hope you don't mind me asking questions as I get familiar with the boat and systems? What engines do you have?

Donzi 54 - I don't know the hull # on the one I'm buying or even how to tell? It's a 1994 model year if that makes a difference.

Curious why you changed to MTU's. Did you have problems with the 12v92's?

Thanks for the tip on fuel tanks, I'll definitely look close.

On a separate note, my haul out surveyor noted the distance from the aft edge of the struts to the props is nearly 5". He said this should be no greater than the diameter of the shaft which is 2.5" . Anyone know if this is how Donzi built them or have similar issue? Shafts appear original so just wondering how much to press on this issue.

RER- do you know much about this boat? Yes, it is Tiger Shark II, hull #5. Initial survey did not come back as good as I had hoped. Current owner is the second since new and had the boat since 08'. Doesn't look like they took very good care of it. Nothing that can't be fixed, I just thought the boat was in better condition. The seller seems willing to work with me on some of the bigger issues. Just hope survey didn't miss anything major.