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Gather Material for Mod. 3a+b

4:2x4x6'

4:2x4x8'

2 Sheets 1/2"x4'x8' Plywood (1 sheet for Mod.3a, 1 for Mod.3b)

2 Sheets 3/4"x4'x8' OSB (1 sheet for Mod.3a, 1 for Mod.3b)

~30: 3-1/8" Construction Screw

~64: 1-5/8" coated deck screw