thcubed,
This is actually my second windmill. The first blew over 4 times and broke (I live in Kansas and we do get winds over 60 MPH once in a while
) I kept fixing it until the last time and then it was just too far gone so I built another from the ground up. This time I used 4 pieces of angle iron 24" long and drove it into the ground 12" and bolted the legs to it.
It has a crank shaft at the top and it drives a "suction rod" up and down on a 2" throw but, it doesn't really do anything as far as "work" or bringing up water.
The entire structure is made of cedar (except for the crank and bearings which are steel) The first one lasted about 3 years and this one has stood for over 1 year so far.
As far as selling it, I have never thought about it and no one has asked to buy it so I really have no idea where I would price it.
The wood is fairly inexpensive and is good with weather, the bearings were about $40.00 and I used long 5/8" bolts for the crankshaft and I guess it took me about 4 days to build the second one. (Face it, the first one took two weeks but, I had a pattern and knew more or less how to do it the second time around
)
I think you could use your same plan and just scale it down so that it would be easier to handle and could be either anchored or moved inside during bad weather. And you would have a saleable item. As to price, that is just something you will have to figure out with your cost and time spent as well as your area people.
Rog