Another Fermentation Chiller

I recently brewed a pale ale that came out with pretty strong fruity and bubblegum notes more associated with a hefeweizen (WYeast 1335). I've brewed about a dozen recipes and this is the first time I think I've run into unintended flavors from too high of fermentation temperatures (and possibly under pitched yeast). I fermented my beer in a closet, with an ambient temperature of 72 degrees (my AC was running non-stop!)

Naturally, now I'm looking into building a fermentation chiller. I've seen the Son of Fermentation Chiller mentioned a lot and found the guide for building that online:
home.roadrunner.com/~brewbeer/chiller/chiller.PDF

I like the size of the chiller (I typically only have one beer fermenting at a time), the cost is in my budget, and it seems to be a pretty proven design. It is not clear to me from pictures, and my own measurements lead me to believe it will be a tight fit - will a 6.5g carboy fit with enough room for a blow off hose? If I read the cut sheet properly, the chamber will be 28 inches tall. My carboy is 22 inches tall. I think I can fit the hose in there, but it will be snug.

I'm still early in the planning stages. I live in a small one br apartment in Chicago, so projects like this all come down to planning.

My first question, before I get too far ahead of myself, is about the material. Is this the correct foam board?
http://www.homedepot.com/Building-M...splay?catalogId=10053&langId=-1&storeId=10051

What is the best way to cut this stuff? I think the Home Depot by me has a table saw they'll cut lumber for you on. Maybe I could get them to cut this up for me on their saw. Or will a table saw rip the material up?

 

It's easily cut with a straight-edge and a utility knife. Rather scored, then snapped. It really breaks pretty clean.