Nice. Are you using scrap for the caster mounts or ordering them? I have thought about eherms since you mentioned it. I like the concept but i already have purchased the equipment for direct fire mash. But I will definitely upgrade to herms coil in the HLT in the distant future, it would be easy to just add a coil to the inside of the HLT and then control mash temp by recirculating it through that coil and just control the HLT water temp.