One thing That I do every now and then, is do a tutorial on some models that do not have adequate or dubious instruction. Case in point, Jan's fantastic Aliens dropship. His instructions are great but there are some fit problems with the short wings. Many of Eli's 40K are good but a build thread helps out tremendously. With PDO's, I always have a problem, because I do not know what is the first step in the build and many times I get involved and find out that I got ahead of myself and have to do a secction over again. Build threads are invaluable in the building of models, and helps out the whole community.
By the way, it is still a great model build and we need some other stuff besides Imperial or Astartes. I hope that your son gets the bug and surpasses his father in the building of models.