Thnks for your critiques, i agree thinner thread might be better, actually i used 0,8mm but the the distance between holes are 5 mm, i think 4 mm will look much more better. Before i made different coin case part and was able to stitched to the main mart without any space, this time i wanted to try this, with this technic it is a bit difficult to stitch all layers together without any space at the down part, possible but difficult, i think if i leave space on sides same as down part, it could be better.