I'm going to do this because everyone will know, to be off the map you need to be above 32k or riding the 32k face to the target, and the 163 field is right next to the HQ\city. Makes it easier for the 163 guys to save fuel. Otherwise, I'll just saturate the area with Flak feilds and everyone can dance in the puffy for two sectors.
In this screen shot, the brown right angle lines are the actual border of the clipboard map while the border mountain wall is just past it defined by the gray line. Why don't you build your version of AH wonderfulness if you believe you have a better solution? Easyscor is happy to get you started from soup to nuts.
Here is the total view of the terrain, the brown line in the previous screen capture is the edge of this CBM map which is the arena total area of 10x10 sectors. I clustered the main strats mostly together, so if I saturate that area with Flak bases, what fun will it be. The wall will keep 99% of the HQ\city raids honest and fun for everyone without a sea of puffy ack.
Only two island mountain ranges left to sculpt and paint in trees and other clutter. And those six little shamrock shaped islands looked like a great idea until I got on the ground level to sculpt in the GV combat area for two inbound spawns on the first one. Always something looks great from 50,000ft, and then you spawn out into it and it sucks big ones. At least I worked that out on the prototype. It just takes a few hours to build out that tiny island based on the first prototype I tested up at 10, 13 for about two days to get the terrain right for GV combat. I have three left to go.
And then, all those white squares are place holders for base\strat\port locations. I have to lay them in, add towns, spawns and task groups, then micro sculpt the local GV combat terrain and even add bridges across streams to about 15 airfields off the GV spawns. So you should try your own terrain and build in your ideas, they sound good on paper.

Bridges for GV combat now work in this game, and the sniping will be leathal.

