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Yes one long hose from the rad back to the coolant tank.
I don’t know about putting just water in. It may be a good idea to fill with some sacrificial coolant and after a few short test runs drain it to flush anything out.
I have various lengths of hose that should be suitable if you need some. May be a good enough excuse for me to get out and you can have a look over mine for reference.
It’s a little noisy with just the manifold but it will run.
I put the regulator on the chassis because it got in the way of the throttle cable where most people have put it by the lifting eye.
I put a couple of rivnuts in to hold it and it is absolutely fine requiring no reconfiguration of piping. There are no fouls. I did relieve the bodywork a tiny bit as I was fitting it because I thought it might touch but when I had finished aligning the body, I realised that I needn't have bothered.