airplane construction

Hi,

I'm interested in learning more about airplane construction, say maybe a
Cessna 172. I know the basics of airframes and power plants, but what
I'm having a hard time finding is actual diagrams and depictions of the
actual assembly. For example, wing root connections, engine mounts,
supporting structures, etc. I imagine this might be available in a
mechanics manual, but I don't know where else to look. I've scoured the
Internet with no success.

Thanks for your time.

--
Mike