@coldblusteel
Please check trainworld.us for your information about guns and engines. Guns
depend on your gunners level and what class they are.

Engines are more based on ship space shown in underneath the tab for the FCS.

Lanthanide

Engines don't actually have level requirements, just space. So
if the engine fits in the ship, you can put it in use. Same with FCS.

In addition to trainworld, you can use the official site.
Shipyard and Sailor links under the GAME INFO header.

http://www.navyfield.com/info/shipyard/shipclass.asp?MenuDiv=2

At least the naval gun section is interesting, as it lists the space
requirements and damage of ammo for each gun, something you
can't find out at Trainworld. Trainworld seems easier to find the other
stats from though.

www.trainworld.us