I am going to take out the small toilet in the center of the boat. This gives me a 30 x 15 bench and a 10 x 25 bench with some locker space. This is my 15th year as a full time liveaboard so I am used to protecting stuff from rust. It is warm year round where I cruise and very high humidity days are rare. Liberal use of the oily rag and CRC spray should keep things moving. Dealing with chips esp the steel and cast iron will be difficult but I have a shop vac so we will see how it goes. I will have some carpet in the workshop which will be regarded as disposable every few months.
You have thrown a potential spanner in the works though as I was intending to run it off my Vector Maxx SST 1200 watt inverter which turns out to have a modified sine wave output. So I need to find out if it will do or will the magic smoke escape from the lathe speed controller the first time I use it.
My Honda generator has a pure sine wave so that should be fine JUST NOISY.