Help with hole.. how to fill the borders? can you help?

help with hole… how to fill the borders? can you help ?
Untitled2.skp (142.5 KB)

Is the one in the foreground what you are expecting to see?

there’s so much weird geometry in yours it’s hard to tell what’s to keep and what’s to go.

i was able to file the squares with the line tools… but the round one never!!
how did you do it?

I practically started over. I copied the bottom face from yours over to the side. I then used Push/Pull to extrude it to the full height. Next I drew the edges for the recess and pushed the center section down. That’s all there is to it.

can you share the file please?

Untitled2.skp (178.1 KB)

thank you!