Coils are potted into the holes with resin,and channels cut into the ply for the tails,so as to keep everything flush. If repeating the process ,I would glue some thin sheet laminate to one side, then lay the coils in place, set them in resin,then glue another sheet of laminate on the other side,before sealing the edges with resin and maybe glass fibre tape. As the coils need to be very close together,I left just a wafer thin piece of ply between the holes. Without this ,the whole middle would fall out of the stator when the holes were cut out. Oh! It didn't actually cost nothing. I paid £15 for the winding wire as spool ends from a guy who rewinds motors, the threaded rod,nuts and washers were donated by a friend,and the resin and ply were leftovers from other projects. Sorry, I did not take any pictures of the alternator construction,but I will post some pictures of the completed turbine which is up and flying. Early tests look promising generating good voltage,but I am awaiting delivery of an ammeter from ebay to measure current and thus calculate the output. Thanks for your interest. Pete.