Hey That's the plan
Saw your map, really liked the look of it, so I figured I'd give it a run around and share a few thoughts!
I really liked the theme you were going for. It might just me, but I'm a total sucker for hydro/powerhouse props. I think you have a good structure here so far, but I do have a handful of recommendations. For one you seem to have an awful lot of empty space in some of your playable areas, not to mention some really long sightlines, including one in which you can see all entrances to the point from which is not a good idea for a koth map. I think it's just slightly over-scaled in general, and shrinking down some of the large empty spaces and placing more cover would make it much more fun to play as other close range classes. Of course, I would recommend testing it before considering making any changes, for all I know it could play just fine and I could be crazy.
For some more detailed feedback, I have an imgur album here:
Otherwise, Great work!