Rootboy! That's great work.
The 'stop plate' you made... I bet I am not the only one looking for a Mavic SSC rear derailleur stop plate. I and many others will be willing to buy them off you if you decide to go into production.
This ebay auction shows the washer/plate:
http://www.ebay.com/itm/Vintage-Mavi...item27c18a7fa4
And here:
And you could probable sell them on Ebay also... What do you say
?