Thank you for all the information

if I consider to change the engine would the "pure" frame be worth 23000$?
I could fly with this engine and maybe change later …
Are there any “weak” spots I have to take a closer look? Can a frame, control-cables etc. or the fabric become “old” over 6 years? Or is it rather a “new” plane? I have seen several from the early nighties with prices around 15k$ to 20k$

Greetings
Thommy