Here are the pics of a pneumatic tail wheel retract. The brace holding the rudder and elevator push rod tubes had to be knotched out to allow the pneumatic line attach points to pass forward. Since the brace was compromised it was then strengthened with 1/8 Sig plywood as can be seen in the pic. Also there are two other points to consider. Notice that the tail wheel door hinges are not epoxied in but 2-56 screw and nuts were used. They were hinged in this manner to allow them to be taken off for ease of maintenance in the tail wheel hole. Also, the original method to open the doors on extending caused exceedingly too much friction and the tail wheel would not come down. Notice the pic where two round plastic buttons were used eliminating friction through the complete gear swing. The button can be purchased at Lowes.
Hope this has been helpful.