Trouble making organic shape solid - file attached

[chyps]

Hi,
Newbie here
I'm having trouble making my building component solid - I've used the solid inspector extension and it says "all shiny" and I've used the cleanup extension and I can't find any loose ends. Am I missing something?

I want to punch a circular hole in the wall of the building component along the red access using the cylinder that I've set up - I was going to do that using the solid tools - but I can't do it until the building is solid. Is there another way to do what I want without using the solid tools?

Cheers,
Ben

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BAS110 Model.skp

[Dave R]

I guess you got your question answered in the SketchUp forum so this is finished business?