4*60 would be a great second plane if you wanted to go larger...the 4*40 if you wanted to use the same engine out of the Nexstar. If you build the wing at full width it will float like a trainer. But build it shorter by one or two bays on each wings and it will be perfect. There is also available now the Venture 60 which was designed by Bruce Tharp that designed the 4* series before he left Sig. the Venture is a better plane that the 4*.