Thank you guys, I'm really glad you like it
Resin which I've used is made by
Prochima and it's called "Sintofoam resin1/1"
http://www.prochima.com/eng/product.asp?id=10Prochima sell lots of good products and also have in its wide catalogue a rubber conceived for resin copies called "Rubber gls-50"
http://www.prochima.com/eng/product.asp?id=1but I haven't use it because it isn't a 50-50 product so it isn't too easy to use (Actually I have a Precision Weighing Balance, but to be honest I don't like going mad to calculate the right ratio between rubber and catalyzer...

)
For my moulds I've used a product made by a small Italian company
http://www.utensilirevelli.com/gommasiliconicasil35abfast500gr_prodotto_3869.htmlI've chosen because it's a "50/50 product" and because it has the HUGE advantage that after about half an hour it's already catalyzed, so it doesn't take me ages to obtain my parts
I'm quite satisfied with my results, but I stll have to work to have the better fit.
I think I'll use white Milliput putty and maybe some plastic card
I'll let you know my progresses anyway
@ Dave, I'm really glad that my references have been usefull for your T-62 but the merit for that outstanding job is only yours
@ Olivier, thanks a lot but I think that my copy is too rough to be sold

Cheers