Berm Shed design for Fred's Plot

I am attempting a design per Fred's berm shed ideas.

I trust that Fred and Paul will critique this going forward.

Requirements:
1) Fred wants a middle cell 12 feet wide;
2) Fred wants side cells 6 feet wide;
3) Fred wants a depth of 18 feet;
4) Paul wants to employ the "attic" cell design at the berm shed's termination ends. This is the termination cell design that Josiah was a part of developing at base camp's current berm shed.

My model short-comings:
1) I modeled the round wood timber as large square timber to make my work easier at this stage;
2) I didn't place a fascia board and the cute shingles in front, as seen on base camp berm shed;
3) I didn't place the moisture barrier layer and soils above.

My assumptions:
1) Over-hang in front needs to be 2 foot;
2) Borrow column and beam techniques from base camp berm shed;
3) I provided a truck over-head clearance of 11'-6" at the first beam.
4) The beam heights step down 1 foot for each column going into the shed resulting in a slope of 2:12.

Questions:
1) Does the base camp berm shed have two moisture barrier layers? One wrapping the structure, and one just below the growing surface? I don't think it does, but I have that question.

Here are some more images from this initial model.

Seems like it would be easier to just make the whole thing 18' deep instead of having it shallower on the side cells?

I think that there are "bermshed 3.0" designs that eliminate the shoulder stuff.  Maybe that can work here?

Mike Haasl wrote:Seems like it would be easier to just make the whole thing 18' deep instead of having it shallower on the side cells?

I think I did this for two reasons:
1) length of the front beam on attic end cell;
2) length of the roof poles at attic end cell.

paul wheaton wrote:I think that there are "bermshed 3.0" designs that eliminate the shoulder stuff.  Maybe that can work here?

I found some of the illustrations by Kyle on page 3 of the berm shed thread.

Please see the following revised design: