I see that you added GTA 3 & GTA VC on this huge ass map and other custom ones by you and by few other people. But here are my thoughts;
It would be good if the server could have an average of 200-300 players. But considering the activity of the server, there's only about 100-130 people only at the middle of the day. It will also (I suppose) consume a lot of server ram, which can cost a lot of money to keep the server running. Another possible problem is that it could have lots of bugs since it's a mod. And of course, FPS problems. Consider the current SAES maps & mods + this, would be even bigger and laggier.
+ Adding helicopter to the disk won't probably be possible since you can only obtain them through g/s/c vehicles and/or donation. But I don't know, maybe when this mod is possible, They will.
Overall, looks good, looks fantastic but I don't think this map is for MTA considering this huge map.
Good suggestion, good architecture skills & shit. Keep up the habit.