I'm happy to report that we passed final inspection this week for plumbing and electric. The only thing we had to fix to pass was adding a GFCI outlet.
I started sheeting the interior with 7/16" OSB which I painted ahead of time with a coat of Valspar 4000 in flat "Repose" gray. I'm using a 1.5" cabinet screw spaced every 16" or so for install. I have also left 3/4" gap from the lower edge of the sheet to the floor to help avoid wicking up spills or mop water.

I expect to get all the walls covered up to the 8ft height with 32 sheets in total. Including 5 gallons of paint and the nicer-than-needed hardware I should still come in under $500 for the interior-wall-finishing project.
We have had enough days in the mid 80s now to realize that the ventilation upgrade needs to happen sooner than later. My target has been to clear the building in around 2-3 minutes (recommended for engine exhaust and welding fumes) which will require about 6,000-8,000 CFM.
For most "economy" shutter mounted exhaust fans (i.e. in budget) I would need a 36" unit for that flow rate. As it turns out though that won't fit the truss bracing! So I have decided to go with two 24", 2-speed fans. The cost increase is marginal and this set up will allow for
4 5 different flow rates, in theory.
I marked out the edge of the flange with masking tape for visual confirmation/test fit. Left side aligned with center.

I started sheeting the interior with 7/16" OSB which I painted ahead of time with a coat of Valspar 4000 in flat "Repose" gray. I'm using a 1.5" cabinet screw spaced every 16" or so for install. I have also left 3/4" gap from the lower edge of the sheet to the floor to help avoid wicking up spills or mop water.

I expect to get all the walls covered up to the 8ft height with 32 sheets in total. Including 5 gallons of paint and the nicer-than-needed hardware I should still come in under $500 for the interior-wall-finishing project.
We have had enough days in the mid 80s now to realize that the ventilation upgrade needs to happen sooner than later. My target has been to clear the building in around 2-3 minutes (recommended for engine exhaust and welding fumes) which will require about 6,000-8,000 CFM.
For most "economy" shutter mounted exhaust fans (i.e. in budget) I would need a 36" unit for that flow rate. As it turns out though that won't fit the truss bracing! So I have decided to go with two 24", 2-speed fans. The cost increase is marginal and this set up will allow for
I marked out the edge of the flange with masking tape for visual confirmation/test fit. Left side aligned with center.

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