I am doing the same thing. The decals can be purchased from www.carlgoldbergproducts.com. There are two sheets, they are $9.95 each. They charge a flat $11.99 for shipping, so you might want to pickup a few extra items. I'll probably get a new canopy for mine, as the previous owner painted the one I have.

As for the stripes, I'm not sure, but I think I saw 7 red stripes per wing on the photo I saw of one of the real ones. My wing is 29" from fuselage side to end of wing (not counting wingtip). Alternating would mean 14 stripes. This would mean each stripe is just a hair over 2". Looks like there is about 1/4", perhaps an 1/8th" space from the red to the blue.

I'm doing mine in all monokote. Missle Red, Insignia Blue, and Jet white. Good luck with your project! Mine will have flaps and a Saito .91 on the front.