I found it significantly lighter when I removed all the removables.  Still pretty robust though.  Now for a good coat of paste wax wherever appropriate.   Good luck.

Looking forward to your first project with it Andrew.

Andrew, I just saw something that appears to be black mold just to the right of your gouges.  From experience, that board will totally rot through in just a few months.  Our garage was professionally built, and just had a few links in the roof.  In 10 years, I had to completely have the building redecked and reroofed.  Please test it for weakness and if it is mold, spray some bleach on it to see if that will kill it.  I hope it is just oil or black spray paint.  Just a heads up.  

Its not black mold I just went and checked just dark sawdust that I need to clean off the wall.  But just because of that statement I will bleach it as well this morning.  So either way yea I don't think its mold the ply board is quite solid.