What should I do inside the Model Room?

Hint 1 of 7:

The Model Room could be considered the main control center for the entire
complex.

Hint 2 of 7:

The miniature buildings represent the real locations.

Hint 3 of 7:

A controller designed these structures so he could unblock doors, either for
entry or to open the flood gates and fill certain areas with water.

Hint 4 of 7:

Be careful here!  If you touch the wrong things, you could flood an area that
you need to access later.

Hint 5 of 7:

It might be a good idea to save your game before touching anything.

Hint 6 of 7:

Look down into each of the miniature buildings and notice the highlighted
areas.

Hint 7 of 7:

Find and click on ONLY the ones in the waterfall, cathedral, and two in the
chimney area.