In a rusty corner of my memory I have found a thought that John Winn, a stalwart of the SBA, was involved in the design and construction of a small gas turbine. If you are interested in following that up, just contact the SBA Secretary. John is not on this Forum as far as I know, unless he uses it as a lurker. Those who know John will fall about at that idea as I cannot imagine him lurking in any context.
Read this first then introduce yourself here.