I have a Neptune and it's a great plane, with one exception. The covering sucks. Last time out on the third landing (A little hot) all the covering on the bottom peeled off. Thank god the bottom is ply.
Have sheeted the sides with some surplus 1/64 balsa had on hand and covered the sides and bottom with 3/4 oz glass, and painted. Hope to fly this weekend. Been hotter than h***l here. (106 yesterday)