That is a beautiful ship. save the .sment file of it to a storage device (thumb drive, hard drive, etc.) and then try re-downloading your starmade. If the problem persists, it may be a weird issue with your ship itself, in which all of your work is lost sadly.
And yes, add some turrets. Give them a good firing arc by placing them on the side of your ship in that flat-ish area near the back, the area that looks like it may be the engines. Just my advice and nice use of wedges of corners.