Not if he builds the correct type of support. He may want to consider using steel instead of wood as the support for the top tank. It will offer better support and leave more room for tank maintenance.You need to have some support at the front for the top tank..
Off course to hold the 150+ lbs of hanging weight it will have to be firmly attached to the studs at several points.
Personally I think it will look pretty cool, but I would hate to do the maintenance on that lower tank. 36.5 inches would give this 74" guy a major backache.