double post to share some of the qualities of this game with you:
In terms of building, there is a relatively detailed engine creation system, as well as in-depth weapon creation (similar to starmade's, but in my opinion vastly superior). The game also tracks both drag and buoyancy on vessels, so there is a lot of design strategy on vessels: Metal ships need sealed rooms inside or they will sink and flying boxes will be incredibly inefficient at using fuel... that is if they dont crash. Anyways, back to guns. Not only is there an armor sloping system, there is an armor penetration system where the gauge of your cannon and type of ammunition it uses is taken in to effect. (ie wooden ships get destroyed by explosive rounds, but AP rounds do little in way of quick damage, and while armored ships are armored anyway you put it AP rounds are the quickest way to breach them). Missiles/torpedos are there too and are just as customizable, but i havent fooled around with them too much so I wont elaborate.
In terms of combat, you can build your own fleet/airforce/spaceforce and equip it with AI to do battles with your enemy. Again the AI is very nice and is quite advanced in terms of what it can control. Of course, with different block types you can control your own ship from any location on said ship, or if you prefer only automate some systems and leave the rest purely player controlled.
Very solid mechanics, and wickedly fun battles. (Although a stupidly hard mission to unlock large propellers :C)
EDIT: Did I mention? Hitting a vessel's fuel/ammo barrels will cause an explosion!