Hi all. my husband is interested in building his first ever model. It's his birthday coming up so I though a model aircraft would be a good gift. Problem is I don't know where to begin. He is 47. he has never built a model before. I want something they will keep him busy. I don't want something that he will complete in 30 mins but I don't want something that is so hard that he gives up. Can someone recommend a good purchase for his first try. Many thanks.