For the skirt on the hovercraft why don't you try garbage bags? I have made 2 hovercrafts that run on .049 gas engines and are about half a meter long and I have used strips of garbage bag for the skirts. To connect the garbage bag together just lay the two pieces on a wooden block, draw the shape of the seam you want on a piece of paper, put the paper on top of the two pieces of garbage bag and run a hot soldering iron over the paper in the shape that you want. Also while I think that the helicopter is a good idea, I don't think you quite know what goes into one, the micro rc helicopters have a minimum of 4 channels and an onboard electronic gyroscope hooked up the servo's the bit radio just doesn’t have the versatility for a helicopter.
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