create a rectangle
copy the rectangle and rotate it 90 degrees
join the rectangles at both corners
add a spider's web
adjust this to the corner
copy the corner
subtract the corner from the spider's web
select the spider web and edit node
remove the excess nodes
connect the corner to the web

Cut everything out with the laser
if you want to change the size, that's no problem. but make sure it's not too small, otherwise everything will be too delicate and could break

I used acrylic paint for the painting
you should be careful here so that the paint does not accumulate in the corners

stick the spider in the web
it is recommended to put the glue on the web