This has been on my list a while. I was surprised how hot the fluid gets when wheeling at low speed in technical spots. I learned this after having a leak on my return line this past spring.5/12/19: Installed a Derale 13212 power steering fluid cooler, with Magnefine magnetic filter on the return line. Also changed the fluid with Valvoline MaxLife synthetic ATF. Almost certainly overkill for my typical usage, but still a fun worthwhile project.
Love your build.