I would definately rethink your hotel choice, in my opinion. Your son may want it all, but he is a kid and he will be getting it all and over stimulated anyway because he is in Disney. Your husband will have a miserable time if he can not relax and get away from it all. Don't mean that to sound so harsh.
We have 20+DLR trips and 3WDW trips, with a Vietnam 100% disabled PTSD vet. We use to stay at DL hotel, and POR and such, we use to try to do it all, we use to stay together and go on every ride for the kids sake. He left needing an out patient daily program, I left needing a vacation and the girls left in tears vacation ruined.
Now we never stay in a Disney hotel, especially at WDW when they have SoG. The place is the best of everything, largest rooms of any Disney hotel, and on site. Queen comfortable beds, not double hard beds. Large rooms with room to move, balconies and patios to sit and drink coffee. Quiet halls and hotels rooms, very little noise. Quiet walks to poly to catch bus or monorail, or grab the taxi golf cart down and less of a walk, or even better take the buses there, they are less crowded, less noisy and always on schedule, never a wait if you remember the times. The resturaunts are less crowded, the lobby is quiet with no crowds, the pools are quiet with no crowds. Plenty of room for him to get a break and refresh to do more hours In The parks. Less of a Disney feel, sure but much more peaceful for a PTSD vet. The ability for him to regroup and get back out there is going to save a lot of heart break.
Also, a tip we found after years of trying to do it all together, give him the right to leave when he needs to. Before he gets to overloaded. Send him back to the room for an extra break, or for dining, and take your son. It will save your sanity in the end.