Star Destroyer "Viking"

This is just a very simple design of a star destroyer, that I came up with. It is very simple, due to that I was learning how to do these things at the time.

Short explanation:

The giant globe thingy is the command center, engineering bay, and reactor.
In front there is a hangar bay, and it's doors.
The front spikes and the ring that should be at the end of it, were supposed to be kinda like a superweapon of some sorts. The spikes were some sort of energy relays/condensers.
The bottom i