Hey!
Now, I have found multi-cave-spider spawners relatively close together, but unfortunately they're on different Y axis' - I have difficulty building a spawner with multiple levels - Therefore I am interested in hiring someone to do it for me. I'll be paying handsomely provided it works well.
If possible I'd also like a Map with the design or a video showing the design you'll be working with.
Location : x: -3189
z: -3768
[If you've activated the Sky-city waypoint you can go through it's Public Netherportal and exit back into the Over-world through mine.]