Thanks for the warm welcome gents.
In reply to Brian, my friend is making a replica 1910 steam crane which was manufactured near Motherwell by a company named Marshall and Brown (?).
He remembers seeing the crane in use during his working days. He is trying to work from memory and from photographs that he took during his working days because he doesn't feel that it would be possible to find drawings.
To David, yes I'm going to scour the site. You never know, if there is anywhere that I'll track some drawn information for him then its here on this site. I have already told him about it and he is very keen to get on to have a look for himself.
Regards,
WB