Busone, sounds like a good idea, ducting the A/C outputs....the water chillers sound complicated, tho. And heavy!
Home Power magazine has done articles IIRC on low-tech and do-it-yourself A/C systems, including low-voltage and belt-driven units, plus supplier lists. It's been a while since I had a subscription to their fab magazine, check their web page (google it).
I've seen free A/C window units on Craig's List, and also on local Freecycle lists as well. 110 and 220 VAC units, all sizes.
For me, the local Craig's List is:
There will be a sidebar with links to other Craigs Lists around the world and U.S.A.
Google Freecycle, find or form one in your area.