Tarek, cool design. Love the multi-role aspect of it. I, too, am working on a multi-role ship for an alternate Trek-verse. But I'm insane enough that I want to do full internal deck plans for an eleven-deck 325-meter long x 100-meter wide cruiser with 350 crew.
As another newbie to SketchUp, I noticed a couple things about your images. It appears that you are doing screen captures and cropping down in Paint of some such. You might want to check out the command File -> Export -> 2d Graphic. You can then choose JPG format.
If you want to keep using the print-screen method, you might want to select View -> Axes to un-check the display of the red/green/blue X-Y-Z lines.
For the top/front/side views, I like to select Camera -> Parallel Projection and then Camera -> Standard View -> Top/Front/etc followed by Camera -> Zoom Extents (and maybe scroll-wheel to zoom out a little with the cursor centers on the image). This will help make sure all the edges look bee-line straight and not jagged / stepped.
For the three-quarter view, I prefer the Camera -> Perspective and then Camera -> Standard View -> Iso (or simply Orbit/Pan/Zoom around to get the shot you want.
Again, you've got some cool ideas in your head. Thanks for letting them out and sharing with us.
