I've enjoyed this thread about what to consider when building a new home and incorporating this hobby into the design. The thread is much more than what a model room looks like because quite frankly, during the planning of the construction the layout and furnishing of the room doesn't seem as important to me as the other issues like the relationship of the room to airplane storage, outside access, easy access to a lavatory, adequate closet or cabinet storage, proximity to shop equipment, and such.

The room will take care of itself after construction of the house is finished, but the other issues will then be somewhat fixed in place, so, forget the room for now other than having lot of plugs and lighting and a size that suits your needs.

If your primary aircraft storage will be the garage ceiling and walls, then the room should be adjacent to and have a three foot door minimum between it and the garage, better yet would be double doors.

As noted in the above post, there should also be an outside door to the back or side yard. This will allow taking a project to the patio for planing or sanding, or easy access to an outbuilding and shop equipment.

There should also be a half bath adjacent with a laundry or bar sink.

If possible, have access to the room through a hallway in the house rather than having to go through the garage.

Last, a fairly large walk in closet with lots of shelves would be ideal.

I know, this sure seems like a lot of doors and no wall space left. Consider the hall bath and closet in the hall on either side of the access to the house to eliminate two doors into the model room. That leaves three, one to the garage, to the outside and to the house.

Last, if an outbuilding is not in the works because of codes or space... consider adding some space to the garage for some shop equipment.