I'm not sure whether they have two versions, or have changed the design over to blue faom instead of built up. In my earlier post, I was just noting that the one I have here has blue foam, and the threads I have seen here on RCU show the same plane being built with a built up fuse. Might want to ask the guys at OMP about that one. If I had to guess though I'd say they changed the design some to lighten it. This balsa sheeted blue foam plane **has** to be lighter than a stick built and sheeted plane. The wood is really nice in this kit...I cannot say that enough. It is beautiful rose colored wood with continous grain, and there are no small 'knots' or anything in it. If you need more info on it here is there URL >>> http://ohiomodelplanes.com/