Great Space Race Intergalactic Transport

So I made a random ship a couple days ago. It's a huge ship that's about half the size of an O'Neill Type 3 Colony, maybe a bit smaller. S'going to be part of my Great Space Race. This particular ship is an "intergalactic transport". It can store a lot of large ships in its front loading bays (Four massive loading doors on each side of the transport). The sphere near the center of the craft supports a small city, enough to hold a pretty large population; mainly the crews of the ships it carries across intergalactic distances.

While it has an internal energy supply, it still utilizes solar collectors in order to provide energy to the ship. When in a star system it relies on this solar energy to power the craft and while in the depths of space, it relies on its other power supply to maintain its warp engines. When it warps, the arms actually fold back to reveal an additional set of thrusters to assist the jump (And since they aren't needed while warping, moves them out of the way to put them to better use in assisting the warp).

I'll put up a design sheet later. If anyone can point me to the person who made the background (Which I found on google looking for space backgrounds), please inform me who they are so I can credit them.

Maybe some day I'll be able to design my own space backgrounds. D: