The airframe is. I've completed everything (as separate sections) except the canopy. So I need to put it together and mount the engine and instruments.
I'm really excited about getting the 601XL finished. It will weigh about 700 pounds empty, have a max gross of 1320. With me (220 pounds), Jeanene (115 pounds), 30 gal of fuel (180 pounds), I'll still have 105 pounds for luggage. And it should cruise at about 132 mph. (Put in 25 gallons rather than 30 gallons, and it has more luggage capacity than the Cessna.) The wing loading is about the same as the Cessna, so turbulence should not be any different.
What I think is the real advantage is that I can do the condition inspection, and I can change anything whenever I want without a lot of happy hooray. I cannot mod the wings, change engine or probably not the propeller. But almost anything else I can do without a lot of paper work.
On the other hand, the Cessna 150 has given me 5 years of flawless service. If I had my druthers, I'd like to keep them both!