Never built a model plane in my life, so I have no experience with this hobby. Long story short and I will answer all questions. Father passed away in the 80's. I was left his physical estate. He lived in another state than I did. Just now getting to the estate items. Found in the family home attic, 300, yes 300, 1950's to 1960's built military plastic planes and helicopters. They all have decades of dust on them as they were never placed back in a box. I have been told this is called patina LOL. 90% of the models are complete and very well built. Anyway, do hobbyist or hobby dealers purchase built planes? If not, I will entertain the thought of donating them to a museum. Thank you for considering a response. Johnny O.