Surprisingly, accurate 3-view drawings of the S6b are not too common. As Chumpy says the RAF museum has a reasonable number of the original blueprints on microfiche and you can nake copies on their printer at sensible prices. Apart from that I would suggest Profile Publications No39 which has accurate but rather small plans, copies often turn up on eBay. Then there are plans in Aero Modeller from June 1955, occasionally on eBay too. Finally there are drawings made by a guy called Kavelaars who did a lot of Schneider research in the ’70s. These are in the Scince Museum archives (actually Imperial College library) and copies can be bought. If you want more info. drop me a PM.

Cheers

Ralph