I'm building the Top Flite FU4 Corsair 60 right now, this is my first kit and it’s turning out to be a real challenge. Its coming together just fine but I'm starting to worry about the final weight. 8.5 lbs before covering is applied. This last week I started glassing the wing, which is going well. Overall I think the drawings and instructions are very good. Kit wood and accessories all look top quality. I'm not sure what you mean by their range?