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249 bytes added , 20:58, 31 December 2020

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Crude dimensions:

*8'5" x 3'

Hinges:

*See https://www.tmhardware.com/All-You-Need-to-Know-About-Hinges.html

Floor Joists:

See: https://www.thespruce.com/floor-joist-spans-1821626

*Can do 2x6 24" o.c. in Douglas Fir or 16" o.c. in Hemlock, Spruce

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