The guidelines for a shell challenge state that as long as the main floor footprint isn't changed except for allowing for decks/porches or garages and fireplaces, changes to the upper stories are allowed.
With this in mind, I maintained the outer shell of the main floor but slightly altered the second storey to accommodate a bath and 2 bedrooms.
On the main floor I created an entry foyer, a powder room and an office where the second bedroom was situated. I also added a staircase up to the second floor.
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Slate roof with white trim by Mizzyzim. (TSR)
Windows - Rise up the Windows and their Add-ons (TSR)