This is looking rather feasible now. Keri of WMS sells a larger rear setup, and you can get over the handbrake issue with something like this:
http://www.rallydesign.co.uk/product...cs59q9j8d3hao5
AP Racing used to sell a front kit based on 304mm discs by the looks of it:
http://www.demon-tweeks.co.uk/perfor...16-inch-wheels
My CP5200 calipers can also be used on a 304x32 disc (http://www.apracing.com/product_deta...thick_pad.aspx)
So, need to either find some original mounting brackets, or get some fabbed up based on the original design. Emails have been sent out...