On Friday, June 3, 2016 at 3:30:07 AM UTC-7, Jon Towill wrote:
According to the drawings on the Lindner website, the CS77 wings leading
edges are swept back slightly whereas on the CS they are not...

Interesting. I guess the next question would be whether the lift pin and control connection interfaces are the same between the different types. It's not a deal-killer if not; composites make it fairly easy to execute fairly major changes. But it is the sort of complication that might make it economically unviable.

If your aeronautic authorities are cooperative, it wouldn't be that hard to determine the CG range in terms of mean aerodynamic chord (MAC), and use that. Assuming, of course, that the different aircraft have similar tail volumes, but that's probably a good bet.

Thanks, Bob K.