I currently have none of my completed models in a case... wish I did, but money, space, etc. etc. As a result, I'm left with an annual meticulous cleaning process involving soft artist brushes, a tiny hand vacuum (meant for cleaning PC keyboards and the like)... to remove the lord knows how many bunches of cobwebs and dust that accumulate over time. Where the heck to all these spiders come from? lol
The one thing I was always concerned about if I were approach this, aside from ventilation, is actual location. I've always tried to ensure my wooden models are not exposed to direct sunlight. Both as a concern for fading of flags and such, but more importantly, if encased, would not a glass case located in a sunny area work like a greenhouse and literally cook the model by excessive heat build up?