The most important thing to keep in mind when building a base is lane blocking (with fabricator) and influencing spawns with said fabricator.
Most obvious setup as at one of the two spawns, though I have definitely seen a setup work where you use fabricator to block one side of either bridge and your team guards the bridge instead. You don’t really need too many fortifications on this map as Engineer, you can get away with humble or conservative fortifications and be just fine. Del/Baird are both solid picks as Engineer, Baird is probably much better if you are setting up in one of the two bridges, whereas Del is probably much better at spawn.
I’ve only ever seen successful runs guarding one of the two towers on opposing sides, you want to block one lane (the one that faces Dropshot spawn) with fabricator, then the next thing you want to do is to place a level 3 barrier on the catwalk upstairs (the one that connects the two towers) to block enemies from coming that way, aside from that its just typical level 1/2 barriers and weapon lockers depending on which you think is best.
I have seen multiple setups on this map, most players attempt to setup at spawn, although this is certainly doable it is also not the best spot in my opinion because Kestrels/Sentinels can easily wipe your whole team no problem, the best spot on this map is easily the middle area. You block one side with Fabricator, then they (with exception to Juvies/Sires) can only come in one way, this is ultimately much much easier than anywhere else simply because Kestrels are enormous pain in the backside for most teams to deal with.
This map is tricky, seems to have a good variety of enemy spawns to contend with, you want to setup at the Snipe tower that everybody spawns at, the one with more cover, you then want to block one of the paths with Fabricator (you may decide which) and everything after that is just the good old barrier/locker placement. This map is easily the one I’ve played the least on (up there with Bunker, hate the way they look). Baird is superior Engineer on this map due to long sightlines.
This map is easily one of the more challenging maps for a variety of reasons; first of all, you gotta setup very liberally on this map, I’m talking easily over 10 barriers, there are always like 4 different lanes enemies come through no matter where you set up at, but yeah either side (the one with the broken bridge or the one with all them fireflies I think) is fine. I highly recommend Baird on this map, Del can of course do it but requires lots more micromanaging/repairing then the other ones probably do. Pahanu/Dam are probably the two most challenging maps in Horde right now, long sightlines (meaning they can shoot you from many different directions), multiple lanes (requiring lots of fortifications), and just the sheer difficulty with waves 1-10 in particular is sorta what makes these two maps stand out as the hardest in my eyes. Nothing you can’t handle
Any more questions?