Brilliant Mephistopholes! I don't even own a drill, but there are mates I can hassle... Should be alright then.
So I will take caution when I approach those ultratherm types. It seems like they can be quite vicious buggers at their worst. There will be tea and biscuits for sure, probably scones and jam too and if things are starting to look really grim I'll make sure there's a 3-course Chinese takeaway at hand and some soothing lounge music on the stereo to keep those homicidal tendencies at bay. If I must, I think I'm also able to recite poetry.
Me also makes a manifold, me do! I was also wondering about the soldering but the discussion between you + BigYin sorted that out. Hmm, you know if the more flexible sort of copper tubing that's used for immersion chillers would be alright or should the tube be of the more rigid sort?