I did a scant 1/4 on this. Then I pressed it open and found that there isn't much fabric on the one side.The threads have raveled. Will this come out or do you think it will be ok?

Will it be used a lot? It may be okay if it is quilted heavily

How much would you have to redo to sew it over?

If it's already raveling - - - -

I am thinking if you quilt over the spot .. or stitch 1/4 around the block when quilting, it will be fine. Just my thoughts.

Is this a crazy quilt?

You could stitch over it again for a little reinforcement.

I did a quilt sometime back and it was made of a loosely woven fabric, I serged over the edges and you can't tell from the front. There wasn't a noticable bulk. It was also easy to hand quilt over. Use a fine thread and zig-zag the edge, it's better than having to repair it later.

I would also resew and make it a smaller size stitch for reinforcement. On the outside mark this spot with something so you remember to quilt heavily over it.

I think it will be fine once it is quilted.

Ditto on this!! Ask me how I know,lol! It's easier to fix now than after the fact.