The terrain editor's maximum elevation for land is 32,000ft and Hitech will not allow that as I was asked to remove a feature recently. On average, keep the world semi real in terms of mountains or features of about 19-20k.
I have one more country to populate with bases, and update GV spawns all around. I have to revisit all the islands in two country's and slim down the mountains upper 1000ft. Then shore battery's and PT spawns for all feilds to fight the 9 task groups.
Center island has three airfields just like NDisles 13 miles apart. Each field has 3 GV spawns and 1 PT spawn to the center. The land ring is connected with bridges while bridges jump you onto the center with the tank town object and you can run your PT under the bridges. I'm still tuning the trees at the bridge heads so tanks can snipe each other to contest getting across the bridges. You have an outer ring of rock escarpment 5000ft back from the TT center at 500ft. The rock features at the land ring areas are 200ft while the TT center is 200ft. On the Exposed rock it is fully open if you want to long range snipe, be careful. I'm still running a panther up and down the farmland to work on blending in some open grass for long range visual guidence, shooting and fast transit while keeping enough hiding places if you decide to drive down to the 500ft escarpment. The maproom is on the airfield with no way to get an LVT in from the water so you will have to run an M3 up from your spawns or sneak in a c47 to make a capture. If you loose your airfield, there are 2 airfields from your country 19 miles out, just pick a new fight to get it back.

*Note to self, you are missing a spawn across 8,9.

Because of the new bridges and that you can place a maproom on an airfield instead of having to place a town next to it, 6 airfields in each country will have this feature. A river between the GV spawns and the airfeild. Less than 3 bridges and there is almost no chance of getting GVs past defenders. More than 3 and there is no point to having any bridges. Spawns are three miles out from the maproom, the river is 2 miles. Once again I have to drive all of these and tune the trees and open spaces for GV combat. The center bridge is a death trap but the fastest path for an M3 to the maproom.