David
There is a drawing here;- http://irishrailwaymodeller.com/content.php/258-201-C-Class-Locomotive-Drawings
Try and find a book 'Irish Metro-Vick Diesels' by Barry Carse ISBN 1-898392-15-3, a wealth of info, construction pictures, numbering conventions, and more photos
Silver, it's got to be silver...
Eoin