1) Don't stack doors.
Multiple doors in a row while fleeing is a massive cause of xeno death. In front of you, you have 3 block deep tissue paper. Behind you, you have the xeno equivalent of sticky resin on any xeno trying to flee. Every xeno who stacks doors is an active detriment to the hive.
2) If you aren't going to build useful tunnels, don't evolve into hivelord.
Drones still have acid, are much faster, and can evolve into queens or carriers if needed. They can also vent crawl. We all love the Xeno space pimps, but unless you're building tunnels to places people want to go, don't.
3) Clear resin walls have very limited use for xenos due to their senses, and are a lot less durable.
They also let humans see in, which screws up the roar ambush your queen was going to coordinate with carriers.
4) If you're putting up multiple tunnels out of one hive, have the entrances be together in a well-protected place.
What I personally like to do is make a 3x3 room (walls are 5x5), and put the tunnel entrance in the (generally South-East) corner, which signifies it goes to the landing zone. Hydroponics is usually in the middle and makes a good forward base. If we all followed this convention, we wouldn't have so many xenos confused as to where the 4 random tunnels in the hive went.
Example:
[]{}{}{}[]
{} {}
{} 1. {}
{}2.3.4.{}
[]{}{}{}[]
Key:[] = resin wall
{} = resin door
1 = tunnel to hydroponics
2 = Tunnel to southwest jungle/southwest dome
3 = Tunnel to south of map (variable based on where the front line is, but I've had success along the south wall)
4 = Tunnel to landing zone
This gives us a visually distinct structure that can be an obvious way for xenos to quickly travel to all parts of the map, no matter how many proxy bases there are.
These also can double as escape routes, as there is no reason not to have them in the deepest part of the base.
5) Put weeds down everywhere.
Weeds are healing, mobility, and camouflage for xenos. They hide hunters better, allow quick fortification, and just generally save your team's ass over and over.
Who else has something to add?
