haiqu

Should be OK. I know Airmar advise the use of water based antifoul on their plastic thru-hulls but they aren't made of PVC. If you try it let us know the outcome, I have an application for that myself. I loaded an ultrasonic antifoul system into a PVC tube as an experiment and the tube itself is collecting marine life!

Not a bad effort. I particlulary like the fact that he broke out a serial port to PCB pins so Bluetooth could be added. I use a Smart Radio SR161 with a Sphinx Electronik BT module, connecting via that to the laptop rather than hard wiring. It allows use from anywhere on the yacht. Cost of that setup was about AU$160 but I got a good deal on a couple of remanufactured SR161 radios, which are no longer available.

I'm solo in a ferro yacht so I'd say the 3rd fire extinguisher is a bit of overkill, as is possibly the 2nd one. I could also do without the expense of a liferaft, considering I never intend to bail out. Statistically, that's the easiest way to die at sea. More examples could be found but it would be gilding the lily.