Hi all, thanks for the positive responses. Certainly a different way of working when producing scale models without plans or castings etc. Everything takes longer and a lot of thinking.
Managed to reach a point of trial fitting the spray bar parts today which I've been working on for a while-
I stripped the chrome off of a 60s car aerial section which was the right size in hard straight brass (5/32" or <4mm).
I failed with reproducing the flanged connecting pipe, as it should be straight and I had to 'dog leg' it to line up.
Probably as a result from having to work from a basic drawing for sizes of a similar make of cart. Still, it's a reasonable representation until I can get to M.E.R.L to inspect the company's original drawings.
The retaining brackets were an excercise in miniature milling and retained with 12ba coach bolts/nuts-
Time to start drilling loads of tiny holes............I may be some time !.
Regards