I have just discovered on a different section of this site that it has been confirmed that the drawings for the frames were indeed wrong and anyone who has made them to the existing drawings is faced with a fresh start.
My thanks in particular to JasonB who has helped so much in sorting out this problem No way could I have argued the case in the knowledgable way you did Jason.
I am adding this thread to inform others who perhaps like me have been making daily visits to this section hoping for a reply when the discussion has been raging on in the Model Engineer section.
Chris.