Welcome Scott,
Sounds like you're willing and able as well as eager to get going and learning all you can
I think that you'll find Kiwi is a very easy and forgiving boat to sail, though probably a bit larger than most people's first boat....but I guess you know that:) On the bright side, you won't have the "3-footitis" for a while(if ever).
I replced my water lines last spring, I guess mine we're still the originals after 33 years.....gross. Anyway, my tanks were pretty clean, but the lines were not, so I replaced all with the same type of tubing thinking that if the old ones lasted that long ,the new ones should as well plus field repairs are as simple as it can get, not needing any specialized tools for crimping etc. which PEX requires. I relocated my water pump to under the galley sink for reasons of simplifying the runs, plus easy access to filters and such.
Start reading through the old posts here on the forums and you'll get some ideas for future project.
You're starting with a great boat
Tom