Hi guys,
thanks for the welcome,
I shall steer clear of posting the converted drawings, but i will post my cad work
all too often i am shouted at in work for using imperial measurements by the welders and fabricators, but i also get a telling off for using metic measurements by the fitters, so i am capable of using both, most of the machinery at my disposal for this project has a metric bias, witch is my reasoning behind the conversion, but to my advantage i can first convert the drawings, then build everything on my PC to make sure everything fits as it should before making errors with materials
would i be right in thinking that the large version and small versions of the Tich boiler both share the same chassis?
Another question that has been rattling around my skull is, would a stainless steel boiler be detrimental to the build or would it be just as good as a copper one?
i only ask as i have all the equipment at my disposal to make and tig weld a stainless boiler but would have to start from scratch (learn to silver solder) with making a copper one,
Thanks for your welcomes and all your advice 
Pete