Caroline S

I am making a "drag around quilt" for my great grandson as a 2nd birthday gift. It is made from the corduroy skirts no longer being used by his 93 year old great-great grandmother. Any suggestions as to sewing the 5" blocks together without creating too much bulk or having the seams come apart? I may or may not use batting since the backing fabric is flannel. By the way, the flannel came from my stash is about 20 years old. I always wondered what I was going to do with it.