Honestly, if you know the basics, why not draw an interior? That's what I
did, a bathroom, and it's a bit tougher than modeling an exterior.
When you can model a toilet, faucets, pedestal sink, sink stopper, etc, as
well as walls, windows, etc., everything else looks easy.
(Or, at least, as easy as it gets in Acad.)
The main trick in 3d in acad is UCS manipulation, I find.
use multiple viewports with different points of view, for clarity
learn how to use point filters
break the project into components for ease of modeling, and assemble them
check out my lisp page, there are some time savers there
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