I'm having difficulty deciding how to zone and properly represent a
particular facility.

Roof:
The facility has a pitched roof that runs east to west the length of the
facility.
The north pitch runs approximately 32 ft in from the north wall with a
7/12 slope.
The south pitch runs approximately 16 ft in from the south wall with a
12/12 slope.
The north exterior wall is approximately 12ft high and the south 16 ft high.

West End:
The western third of the facility has a drop ceiling with suspended
approximately 10 ft above the floor.
There is no insulation directly below the roof, but rather just above the
ceiling.

East End:
The eastern two thirds of the facility has no suspended ceiling.
The space is directly exposed to the roof with the insulation directly
below the sheet metal roof.

South Projection:
There is a southern area with a south sloped roof that buts up flush with
the afore mentioned south pitch.
It's slope is 3/12.

Underfloor Plenum:
The entire facility has an underfloor plenum that is approximately 20
inches high.
An air-handler blows conditioned air into the underfloor plenum and it's
then distributed by VAV boxes to the respective zone.
A hot water loop runs under the floor and to the VAV boxes for heating.

Strategies:
My initial strategy was to group the entire envelope into one zone based
upon average Floor to Ceiling and Floor to Floor heights with a single
flat roof.
But I soon felt this strategy wouldn't properly represent any solar gains
or the exposure of the roof envelope to the exterior conditions.

My next strategy was to divide the facility into three shells with all the
spaces having the proper roof representations and floor to ceiling
heights.
This strategy involves editing the INP file and is turning out to be more
complex than it seems the project should be.
It would include a gable on the south wall to compensate for the taller wall.

Are there any thoughts or suggestions on how to properly model this
facility. I'm particularly curious as to the best way to model pitched an
complex roofs.

Thanks,

JEE