I ran the hoses today. I used the included band clamps for all the hoses, and everything turned out OK. I got an additional 5ft of hose (I asked for 4, the guy at the auto parts store was generous to give me 5ft for the price of 4 since only the 5ft was left, and a 1ft piece of hose would not sell ) for the aux cooler input line. Both of the hoses were too long, but I'd rather have some slack than for them to be too short by like 2 inches.
The band clamps all looked like this. Perhaps I'll eventually replace them all with fuel line clamps from the junkyard.
I didn't tighten the clamp around the stock cooler's output enough at first and it leaked. After tightening that, I tested thoroughly before actually driving by revving up to around 1500-2000rpm in all the gears and there were no more leaks. On the drive back though, the trans was acting a bit funny, seems like it was hunting for gears or something, but maybe I just was iffy with the throttle or something... since it was raining and dark I didn't check for leaks when I arrived home, but will check in the morning. I didn't lose very much fluid, maybe 300mL, and strangely the fluid level still remained in the middle of the "HOT" mark, so I did not need to add any more fluid. I was expecting to add at least some due to the additional capacity of the cooler and the in-line filter... I'll have to check the fluid again.
The stock cooler's output line is on the passenger side as indicated by TSB NTB00-056b "1988 AND LATER NISSAN VEHICLES AUTOMATIC TRANSMISSION OIL COOLER CLEANING".
I secured the hoses using a few zip-ties. I'll need to see if the stock undercover will still fit properly; the only thing that might interfere with it is the bottoms of the cooler's mounting hardware. I will post some pictures of how I routed the hoses tomorrow.
Overall it was a very easy install, didn't take more than an hour total to mount the cooler and run the hoses.