Cob Yoda's cob house

[Will Firstbrook WCB of BC]

Hi List,

Next July were starting our adventure into building with Cob we
purchased 9.26 acres in the Salmon Arm area in the BC interior. One of
the great aspects of the area are there are no zoning restrictions. Thus
no building inspection hassles.  We are currently designing the house
and have lots of creative ideas. Many of these ideas would not be
possible without the mouldability of cob. Yet some of our ideas may be
very difficult to implement. 

One of the area's that seems tricky is my eldest son's room. He wants it
to look like Yoda's house in "Star Wars" movies. Everything in the room
will be curved (uneven yet smooth) cob seems to be the perfect medium.
The whole ceiling will be curved arches. The walls will have rounded
nooks and rounded windows.  A rounded (top) hallway will connect this
room to the main part of the house. This room would be a separate pod on
the East side just behind the East Tudor entrance. Any Ideas on how this
could be done?

Three possible techniques come to mind:

1. In one of the Earthship volumes (2 or 3) Michael Reynolds built an
insulated dome from tin cans and mortar with sawdust/straw insulation. 

2. Another possibility is the stabilized earth & sandbag technique that
Pat Newberry is doing down there in Georgia. 

3. Maybe the wattle and daub technique of getting lots of sticks tied
together in the shape of the structure then using them as a form to
massage the cob into.

Another concern is that the BC interior can get a lot of snow at times
in the winter. And I don't think I could corbel cob to the center top of
the room. Also I would need the roof to be waterproof but not cause a
problem with vapor wrecking the cob. I would like the whole room inside
and out to look like natural cob. Yet cob does not make a good roofing
material even with a lime finishing plaster :>) .

I'm wondering if any of you have any creative ideas on how this may be
accomplished?

Regards,
Will