Update: Two things:
Built the heli tower according to my best interpretation of Raybun's description. 45m tall from the ground floor (14 and a half floors (the top floor is unfinished)), 15m wide on each side (excluding foundation stairs at base). Feedback would be appreciatedExterior (incomplete; I finished windows on the top four floors later)Ground floor (incomplete; rooms for beds added later)Fight floor, inner 3x3 section (Should there be doors in the doorframes or would that impede movement? Also, should there be supports of some kind? (e.g. pillars, wall frames))Fight floor, outer 5x5 ring (Did I get the window placement right?)
Fought a heli today as well. Almost died once. Noticed that the heli only begins firing a machine gun burst if it gets a line of sight with an aggro'd player, and if no line of sight exists, it will wait until one is found before beginning a machine gun burst. Ashtrayhed showed up partway through to help. Got the heli down to about half health before it flew near the ground and just despawned. Like, poofed right out of existence. Tower held up better than expected; only one wall was destroyed. After repairing everything, finishing the windows on the upper floors, and actually putting a bed in the tower this time because I forgot to the first time, Ash spawned another heli and we killed it. The tip about how the heli moves away before launching a rocket barrage was particularly helpful. In conclusion, the heli tower design seems to work quite well, though any possible ideas for improvements would be appreciated