Wow! Does this bring back memories. It is a Fresh Aire. I built 2 of these. The first one was a prebuilt that I bought from Steve Rojecki. I ordered just the fuselage for the second one and had the wings and stab cut. This is the second one I built. I actually flew this in the Nats one year. I'm not sure of the exact year but I believe it was the late 80's. I sold the airplanes to Gary Garabian. I had a YS-120 in it and had good power. I probably wouldn't go with anything smaller. I never used Robart retracts so I'd be curious to know what happened. It is missing the belly pan. I'm not sure where you can get a replacement as the airplanes were put together on the west coast. You might want to check with Maureen Dunphy as I think her company got all the molds. I'm sorry, but I don't remember the cg. I've built a whole bunch of airplanes and I don't have any of this down anywhere, sorry.
Good Luck!
Greg Grigsby