This is an amazing build!
First: Logo. Logos on armor are discouraged until you get your kill stripes. Well clan and brigade logos anyway. If you wanted to do a Rebel or Imperial sigil then you are free to do so.
Second: Weight belt. I've seen them used. I need to double check that they're still allowable. Personally I don't them being used as they scream earth. It kills the illusion of being a warrior from another galaxy when using off the shelf items like tactical gear, shemaghs and weight belts. I don't like them. I would recommend going with something else. But that is just the opinion of a non voting member of APP TEAM .
Third: Mounting. I've mounted plates with velcros, sew on snaps and chicago screws. I wasn't too keen on the results with the velcro. And must echo the concern regarding the weight of the plates. Plastic doesn't the issues that metal does. For your build , I'd go with the chicago screw method. It's the easiest to utilize for vest maintenance. Just be sure to NOT put screws in dead center of the chest plates! If you do you be teased mercilessly by your peers for having nipples...... trust me on that one.
Also remember that if you do go the chicago screw / rivet method that you weather or paint them, as that is required in CRLs.
This a fantastic build. I'll be keeping an eye on this one. Feel free to hit me up if you get stuck on anything. The door is ALWAYS open.