Step 7: Protection
The graphics/polish of your boards, and the work and effort put into this project.
Solution? wrapping the dowels in foam.
This way, your boards will rest on a soft surface, avoiding any kind of damage.
The foam is easy to cut, so using the angled drilling assistant as a kind of template will get you the perfect angle and fit.
After doing this, I noticed the edges of the board (which should be sharp) would be resting on the backboard... not good for the paint.
I have to be honest, I did not go into too much thinking to solve this one. I got some adhesive felt (the sheets that you buy to cut pieces for your furniture legs) and placed some in the angle between the board and the dowels.