A litte area for Feedback.
Overall very nice map, but there are a few things that I would add:
1) More weapons. Pistols, with no head armor | SMGs and others
2) These were you goals:

• Great visibility with no objects/textures behind the players
• Sunny and bright settings for an enjoyful session
• 100% balanced map for both sides
• Random Weapon Spawns with AK-47, M4A4 and M4A1-S
• Great for pre-game aim practice

• Great visibility with no objects/textures behind the players: Yeah you did a good job on that.
• Sunny and bright settings for an enjoyful session: Top, like the first point, great job.
• 100% balanced map for both sides: Obviously, you copied the one side to the other. Yeah it is fair!
• Random Weapon Spawns with AK-47, M4A4 and M4A1-S: Like I said in the beginning. More weapons would be nice, but for the start its OK.
• Great for pre-game aim practice: And there is the problem. The cover isn´t good. All of the angles are Headshot positions and if you duck behind cover you are safe. That ins´t fun anymore.
So what can you do to fix this?
First, use Brush bases cover. Aim_map uses brush based cover only and its, in my opinion, the best aim map out there. You can fix all of the Headshot positions if done right.
Second, dont worry about the look of the map. There are so many nice and free Textures out there for free use. You can detail the self made boxes in the way you want. Its overall way better. And maybe make the covers in different hights so its realy spawn depending how the round plays out, what could be a bad or a good thing. Don´t realy know.

All in all its a great map. With some improvments the map could be even better. I hope you will be working on it in the future, good luck.

P.S.: If you need some basic help at mapping, I could help you. I have contact to a few big map makers so if you need special help I could help you out witch some contacts.