My tear will be 5' wide, so I am thinking I could go to 5' high also (having to buy 5' wide aluminum for the top, might as well get it for the sides also). I want this to be relatively light though and I really like the sleeker looking designs, so my question is "does interior height really matter?" Obviously we will not be able to stand regardless of what we do, and my wife and I are not tall people (5'8" and 5'6") so is the interior height really that important? I want the interior walls to be wood, so thinking 4' high max. for the interior may be best to avoid a seam and since I want the exterior aluminum to cover the frame I would need the 5' aluminum on the sides, unless I make the exterior height 4', but that only gives us about 40"-42" of headroom. Is that enough? Also, does a seam on the wood skin (underneath the aluminum) decrease the strength? If I go to 5' tall do I need 5' wood or can I put a seam with compromising the strength? Please look at the attached photo and let me know your thoughts (this is my first time posting a picture, so I hope this works). Sorry for the rambling.