So... guess what's large, probably impractical and caused a stupid death courtesy of me deciding to make a ladder going down, causing me to lose 1 1/2 stacks of potatoes, among other things to the void (though, thankfully, not my ardite tool set).
That tower and that large cable is purely for a laser drill and it's precharger. I don't know how it works or even if it works (It's shooting a beam down, so I'm guessing it's working). I made it that high purely because I've heard it works better when in level 128+ altitudes. If that rumor's a lie, then I died for no reason.