Amowi, I think it's a really good idea to take advantage of recycling things to give this kind of nice opportunities to childrens. Appart from re-using wooden spools in this case, you are designing a way of learning for childrens. With this, they are having the inspirational chance to have a comfortable, beautiful, happy... place to concentrate in their things while at the same time you are showing them how really good things can be done with only passion and willingness.
I've feel identifyed with this idea with a project we are just starting to run. We also want to work in recycling issues with this kind of objectives of adding value to everything we can. And we are not sure how to focus it but I think this idea could help as creating something bigger.
Reggarding your idea, I want to encourage you to continue doing this kind of things because life will go better with this steps!