Brizbrew,
Sorry for pinching your photo. It's just a quick diagram to better explain what I mean. Burner on top of the rails seems to be more practical than underneath in the same fashion as the boiler. That's the reason why I settled for electric. Gives you the benefit of thermostatic control minus the risk of a flame above your head, at the mercy of the wind if you're brewing outside.
Don't get me wrong, I'm not trying to tell you how to suck eggs. More a case of things I had to work out myself when making my own.
Benefit of hindsight etc.
Warren -
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