Lovely result!
Lot's of work by the sound of it.
Re. wxAstro Capture. I guess you are already aware, but just in case your'e not the Auto Exposure functions need to be unchecked.
Whoops! I just realized that the screen you will see will vary according to the driver being used, and may not look the same, or even have the same controls
I am not familiar with your camera, but most seem to have Auto Exposure as an option