Suggestions Requested

Armchair graphic illustrator here with a penchant for Star Wars industrial design. 

Looking for suggestions for a number of things on the attached image. I know my angles are probably still a little skewed, but if anyone can point out any that need correcting and how, that would be great.

The other would be suggestions for texture. The plates, in particular. I'd like to find some kind of coarse-surface two-color texture I could add faintly in lighter grays to the fills for the armor plates. I haven't found a source of two-color fills that offer the illusion of texture, yet. Right now, I mostly use them for the "glass" effects.

Trying to improve my presentation of this particular ship, so I appreciate any feedback. I've learned quite a bit about CorelDraw here on the forums, and looking forward to hearing some new techniques. If this is the incorrect forum, moderators, please move it. Thank you in advance.