I attached a conformation picture because you were all talking about bone size. He has plenty of that. 8" cannons bones and nice large joints. The body is there, now we just gotta get that mind in gear!
I also wanted to add that he is currently on grass hay, not alfalfa, and I mix my own grain rations to avoid excess sugar content. Since I switched from commercial feeds to cereal grains his energy level had decreased dramatically. Still spooky and wild from time to time, but much more manageable.
Another quick question. I board my him at college with me (we will be going back in Aug) and when I am there I don't have anyone to ride with out on the trail. I find that he is much more confident and less spooky out with another horse so I feed obligated to just do ringwork when I don't have another horse and rider there. Is there any way I can encorporate the trail when I have to ride alone? What I have been doing is riding indoors and taking him for walks out on the trail in hand to work on desensitising and being confident and forward. Seems to be working well, but I feel like I am avoiding it more than I am working on it. What would you suggest?