In my latest YouTube video I review my custom RIMS tube stand build using superstrut as well as another mash tun modification. The RIMS system I'm using is the 12" RIMS package from Brewhardware: RIMS Package with TC heater and PID controller, prewired and ready to use. In order to limit the amount of heat loss in the tun I decided to drill a hole in the top of the cooler lid and use a CPVC extension into my recirculation manifold. This system works great for rising step mashes.