Liam and I built the LEGO Star Wars The Battle of Endor set today. It was great fun. He's asleep at the moment (it's pretty late), but I stayed up and set up a big adventure for tomorrow. He's going to love it.
Here's a video of the set up... so fun!
By the way, the LEGO Star Wars The Battle of Endor set is fabulous. It came with a lot of really fun pieces (e.g. several dark green plates, ton's of angled pieces, 4 fishing poles, etc). The ATST isn't as hard as it looks like it might be. My only advise is that when you build the big building at the end, be sure not to mix up the dark grays and the blacks. It's a bit tricky, but totally doable.
We also got the set 7956, the Ewok tree & speeder set. It's pretty fun too, and much less expensive. Though I will say, it goes great with the big one.