Its difficult to say for sure but it looks to be like it has been in moist area and has dry rot . Its possible that it may never be safe to fly . Fixing it as a static display model might be the best thing you can do . Being good at woodworking you should be able to compare the wood in the plane to some new stuff and see what you think . If the wood is not punky and the ply is still solid then maybe you could refurb it . You will need to re glue all the old glue joints as best you can . CA works okay for this . It looks like you have throttle rudder and elevator only . I would build a new elevator as well as your rudder and rehinge them with hinge points . The windows are just flat plastic and will probably come out fairly easy and will provide good patterns for new windows . Good luck and have fun .