how to i get the added to be solid objects and then intersect with one another.
Colosseum.skp (1.5 MB)
You have a bunch of stray edges within your group, delete them, or as I do here, start with a clean face and pushpull.
Here you see I triple click to select everything in the group, then shift double click to deselect just the face and its border edges, allowing me to delete everything else.
The other one has a little flap that needs to be removed.
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