70+TH
One thing I noticed, much better to throw the hot air 10 feet away than into a wall 2 feet away. (Also notice the box fans only to blow air over the ps, without airflow they get hot)

And derate your conduit!  I used 10awg wire for the 20amp circuits instead of 12awg, which derates to code.  42 x 20amp,
 120v, dedicated 3 phase208 sub, networked neutral.

http://i60.tinypic.com/i1bl2f.jpg

Here is a good pic of the ps mod up close

http://i59.tinypic.com/2zh4daa.jpg
http://i59.tinypic.com/effgp2.jpg

And make sure you have a good helper

http://i58.tinypic.com/2ai07k.jpg


The hot side
http://i61.tinypic.com/2s9bo8p.jpg