Johannes,
I am not very good at soldering and I am scared of boilers bursting so I use a small air compressor to run my steam engines.?
Yes the plans were converted to metric by Mr. J. de Waal in New Zealand, he has a lot of plans on his site which is shown at the bottom of the plans.
I prefer to work in metric if I can but most plans are either old British plans or American plans and then I work in imperial.
Regards
?
Dave
Borneo
David James