I think the roof hump on a scenicruiser is as good as it ever gets when it comes to balanced proportion (that's why I bought a few
I have a very low opinion of the cosmetics & proportion of the peace maker bus, too busy & the body lines don't seem to flow together. But, that's just my opinion to the looks of it.
I like the extra front windshield on the upper level on my bus, it really opens up the view when parked. The dual levels also break up the tunnel or cave effect.
As for overall height, if over 13'-6", you're gonna have clearance issues. Most bridges clear 14', but there are exceptions that will cause the headaches . . . .
A landoll trailer has a 38" deck height, so you'll need to consider that when it comes to 'alternative transportation' of your bus - if it is ever needed. Towing on a hook carries it's own set of opportunities too. Just fodder for thought.
BUT, you shouldn't be building a bus for us. You should be building a bus for you to enjoy
. If you like it, most here will be happy for you & support you every way we can.