I started making the sled today.
In the video you added a 9mm piece to Piece S2 which you don't show in the plans. Is this right?
Also, the position of the first holes you drill in the Piece S1 are shown in the pdf plans only in one side.
I opened the Sketchup files and found the positions of the holes for the other side.
I just mention this so you can updated your plans for other buyers

I will keep posting here (or if you prefer another way please let me know) of any problems I find.
Thank you for your work
