Help with Tumbleweed
 

I am bought a plane hanging in LHS , apparently called a Tumbleweed ( 69.25 " wingspan ) by ATEC , with ST 2300 , no manual or instructions . I have not been able to learn anything about it other than it was made in small quanitity about 2005 . Assuming the CG is at about 1/3 of wing chord , it is very tail heavy , even moving ST 7" out from firewall , now tying to mount old Quadra 42 with CDI and large flywheel . Any infor or experiance would be much appreciated . See attached pictures .

Thanks,
Thom Bradley