Anyway, five years is five years. The engine was properly winterized way back when, but I'm still concerned about firing the Perkins up for the first time. I'm gonna replace the fuel, filters, oil, batteries, etc., before attempting to start. But, I'm wondering if there's anything unique to this engine I should be aware of before attempting to crank her up?
First off, congrats on the new boat.
If the PO was as meticulous as you say, you should be in good shape.
In addition to the things you listed, if it were me I'd probably pull the injectors and have them at least pop-tested. While they are out, I'd shoot a little (just a little) ATF into the bores through the precombustion chambers to provide a little lube in case the bores have developed a little surface rust.
Check all your electrical connections, and clean them up. Don't forget to pull the 8-pin electrical harness plug apart and check inside there as well.
Once you get her running, make sure to check all your fuel fittings for signs of leaks. After five years, the rubber seals may have dried out. You may want to just replace all the rubber ones now -- the scuttlebutt is that the new ultra-low sulphur diesel will leech out the stuff that made the seals swell using the old diesel, and then you're left with loose seals.
Good luck -- keep us posted with your progress.