Just a small point in case you haven't already done it, but you'll need to reverse the blades on one of the fans. The fan blades are curved so that the shallower angle leads, so when you reverse the motor you also turn the blades around to keep the shallow angle leading.
Also, I wouldn't think you would have done this but it looks like the bolts on the left heat exchanger go straight through the tank! Does it have captive nuts on the tanks?