The hill access hatch allows access to a portion of the inner loop tunnel.  The hillside slopes over the middle loop tunnel to the point where it is very difficult to design and build an access hatch for that portion of the curve.  Since that portion of the curve is accessible from the staging area below the passing siding, I didn't bother with it.

 

The picture below shows Oak Mountain under construction.  The bottom of the hatches are at this level inside the mountain.  The wood filler was used to raise one section of ceiling tile so that everything is level.

The shot to the right shows the view down the hill access opening.  It is a little tight, but there is plenty of room to reach in there and clean the track with a rag.

 

I separated the two openings because two hatches would be much easier to handle than one large one, and because the smaller and fewer openings in the mountain would make the mountain sturdier.

 

Due to the height of Oak Mountain, the hatches are more than 5 layers deep.  This did cause some extra work getting all of the sides aligned well enough that the hatch could be removed easily, yet fit snugly enough to stay in place and create as small of a seam as possible.

This hatch was built as explained in the Junction Hill Access Hatch page.  The picture below left shows the clothespins holding the trees in position.  The picture below right shows the glue applied to the "roots" of the trees.

The picture above shows how the openings look with the ground cover applied.  The picture below shows the hatches in place, and the narrow seams.  These seams will be camouflaged by foliage once the areas are scenicked.