Buckeye,
That is dang close to the little cabin I wanted to go after. My plan was 16'W x 20'L. Then, I tuned it way down to become more of a shed.
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When I was planning the 16 x 20, I was going to do the roof at 12:12. The roof framing would extend out over the front porch to create both a covered porch area AND a cool sleeping loft from the inside. You can put a window in the gable of the loft and look out to the pond. Yeah baby!