If you are doing an elastic waist to your skirt all you have to do is add 4" to your finished length and it would be far easier to make than a quilt - for a start it doesn't have to be flat
Personally I would suggest seaming the strips together with a serger, if you have one, or zig-zag the edges together after seaming them; and also make your seams 3/8"ths instead of 1/4". Good luck and hope to see a new skirt on you soon