Many thanks Carl and Breezy, I have most of the initial drilling done now! I'm going to go with Danny Kings idea with 1/4 holes with Silicone sleeves and #6 Screws as he said the rivets after several hundred hrs can be seen through the paint on the skirts.
Tankerpilot75 here's the link
http://www.vansairforce.com/communit...py+replacement