Thanks for your responses - I've been off work last few days (where I've left my book) so can't refer to rail numbers etc, but the last thing I found when 'making' the engine bay rails, was that when positioning them the lengths all worked out but only if the position of BR10 was moved back about 25mm.
So seems the cutting lengths are ok but the position of BR10 so it will fit properly is further to rear of chassis than described in layout diagram
I'll put up some pics when next back in work as it should explain better - Talon, I realise the tolerances are different but my issue is inches (fnaar) rather than hundreths of a mm...
