Tom G wrote:

... does anyone know of an approx figure per sq foot we could use just
to see is this idea would be feasible? We are speaking of something in
the area of 15 x 15 with windows on 3 sides

I built a 32'x12' deep x 16' tall sunroom with $500 in materials ($1.30/ft^2),
standard commercial film greenhouse curved steel pipe bows on 4' centers with
the straight ends slid into larger pipes pounded into the ground and curved
ends tucked under a 2-story house eave, with plastic film on the ground and
shredded wood playground mulch over that.

A single layer of clear polycarbonate glazing might raise the cost by $1K.
You might make a 16'x16' sunspace with 2 8'x6'-tall $269 sliding glass doors
for the south wall, with $300 clear polycarb sides and a $300 flattish roof.

Nick