I agree with previous poster, how often you use the big door is the question, if you dont mind some extra way of pulling it tight it could be sealed but would be a PIA to open close. If you are going to use a man door most of the time the barn door should work fine and could be thicker and better insulated than a conventional garage door.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)