check the used market place ; a lot of those planes are available ; not long time ago
there was a NIB for $ 400
i have one , that i am rebuilding for os .91 engine; i call ironbaymodelcompany.com
and they sold me some parts : a new nose- inlet , canopy , cokpit , and a new engine former
and some small parts for $ 80.-
For the OS .91 i will do some changes

1) glass the wings and paint it
2) put the alerons servos in the wing and the elevator in the tail
3) use two ducted fan tanks on each side of the fan
4) weston pipe
5) use spring air retracts , cause of the shoulder wing design , every time a retracts fails
i have to do a repair on the botton of the fuse

pecojets