One of the mags in WHSmiths has an article on DS and his 400/4 restoration production line. I think it was in the new magazine - Practical Sportsbike (?).
Yes it's
Practical Sportsbikes, Issue No. 15 January 2012, just bought it this morning.
7 pages of pictures and text starting at Page 79.
That's me sorted for this afternoon.
Happy New Year to everybody.