AC Questions

[Solitude]

One winter project is to replace the simple AC wiring in my boat. I rarely use the system but want it to be to up to standards and safe.

I have read about everything I could find here but have a couple questions. I have a very simple system 30amp coming into a fusebox and three serial 15amp outlets. The installation looks clean and neat but it is using solid wire. There is an 8-10 gauge green ground stranded cable running from the ground in the box (and all receptacles) to the DC ground bus.

Currently

Question 1
30 amp older stainless marine receptacle in the cockpit. The back of it has pressure screw clamps for the wire. I thought everything had to have ring terminals? Is this ok today? It is in good shape.

Q2
The wire is solid and I am changing it to proper tinned stranded marine cable. Do I use the regular yellow (Anchorbrand) crimping ring terminals?

Q3
The 30 amp service (10 gauge wire) enters a fuse box rated for 2x30 amp services with two screw in glass fuses. Currently the one 30 amp service comes in and the neutral and hot each pass through one (15amp)fuse. It is not a marine box but a typical small house wiring box (grey metal) With a large manual breaker on the front. Is this ok? Code? Safe? Its inside the cabin and clean (no rust).

Q4
I will replace the solid cable from the box with 14 gauge stranded tinned. The next step is the 15 amp service feeds three outlets in serial. In the first one I installed a GFCI outlet. (This is how I found out about the solid cable.) The boxes are galvanized steel. Should I change to plastic?