I just used wood glue and brads. I glued and nailed it into the edges of the flag, the whole way around and also the ends where the frame pieces meet. I have no measurements for the frame. It was sort of a build as you go type of thing.
Well I cut the stripes down to be 1 3/4" thick. Which will make your flag 22 3/4" tall overall, and I made them 40" long. So the flag is 22 3/4" x 40". As for the field/star area, it would end up being 12 1/4" high X however long you want to make it. I always based that measurement off of preference. Whatever you think it would look best for you. Then I would make a stencil for the stars, trace them on, then carve out with a dremel tool.
I have no idea. I made it so long ago...lol.. Basically I messed around drawing a triangle that I could then flip upside down to make the star. It took me awhile to get it to look right. It may be easier to find one online and then have a copies place like Staples blow one up to size.