Sanding board pic - explain

This is the pic of the sanding board I made and used to sand the kerfing.

I made this as described (or the way I read it) in Stewmac's 000 instructions.

I cut the 2 wedges 8 inches long and at 5 deg and 1 1/2 deg.

I then glued them on to a 2 ft long board .

The concen I had was that in the Stewmac Dreadnaught instructions,it says to make the angle from the centre of the sandpaper to the end of the wedge ,which would be over a length of about 20 inches.

I made the angles over the length of the wedge - 8 inches.... Which makes the sanding angle less than 5 deg and 1 1/2 deg

I hope this makes some kind of sence??

I think Ted's comment might be right,I should stop worrying about the "small" things and just get it done!