From playing there once it already is going really well in my opinion for a brand new facility. Of course something on the east side would be nice but as mentioned I hope it wouldn't affect the current field. Personally a larger field will always be better but economics wise it would be a daunting challenge.
At the current field I agree maybe a third kill house and extending the second story into parts of the field would be awesome.
To also make the current second story a bit more playable a ladder or 2 into the below back alley would be awesome.
And shinobii you are spot on about introducing new people to the hobby, I plan on doing that sometime this winter season at your facility.