Interesting vessel. I take it you like the thruster plumes, and that's why you left the engines as they are, I would try to improve them somewhat.
By the way, you don't need an extra reactor unless you want the redundancy for survivability, you can set up both chamber trees on one reactor, and you can swap between them by reverting/specifying the base chamber you like, you can even leave the rest set up as you desire (at the cost of having to recharge everything after)
P.s. I'm pretty sure that's one of my builds in the last screenshot's background, so I kinda felt compelled to try yours after seeing it ; )
p.s. I often build with a friend and he likes several of your builds, so good catch. Though it wasn't intentional to have another ship in the picture. Let me know if you would like me to remove it.