You could have any offset you want if you mount the motor above the yaw pivot.

These things will always tend to have a high resistance as they are designed for high voltage. Remember you are trying to extract power at a fraction of their design rpm, you must expect only a fraction of the original rating.

It so happens that for wind duty with the good thermal contact between the wire and the core and a howling gale blowing over it they can be grossly overloaded compared with the original rating and still survive. This means that you can get a lot nearer the original rating than you would for continuous duty at low speeds in engine driven applications. You must expect the full load efficiency to be low. This lets the prop run clear of stall and you get more power from the prop than the "stalled" air gap machines.

This comes at a greater prop speed than the air gap machines and this higher speed also helps to get more power from a small well overloaded unit.

If you can find the gap flux using FEMM then you can predict the output voltage if you know the turns ( unlikely with an original winding).

I was interested in that last one that Peter wrote about. The gap flux is surprisingly low ( not much above an air gap machine) so it looks as though you could throw a lot more magnet at it although the 4 pole arrangement would be very difficult without proper curved magnets. These strings of little magnets don't seem to get the flux up as far as I would have expected, but with all the gaps between them, approximations to the stator curve and the relative ineffectiveness of small magnets then I suppose this is not surprising.

At least you folks are less likely to have starting problems with iron loss compared with the commercial Chinese machines that have well designed magnets to fit properly. They no doubt get more watts for a given size machine with lower low wind efficiency and possibly better high wind results.