Office Revamp - 14

But it turns out I needn't have bothered marking, as they hit exactly at the height of the center (now top) side support.

 

Here you can also see I ran into a bit of splintering on the corner as I finished sawing through the rail - Ooops. I guess this teaches me that next time I saw something I need to do a better job of supporting the piece being cut off.

Done