Knife sharpening

This is my first project so i apologise if the information is incomplete.
List of material:
16 mm aluminium tube for main body
8 mm aluminium tube for vertical stand and slider.
2 pcx 8 mm linear bearings
1 pcx normal bearing (6 mm inside and 19 mm outside)
some 3-4 mm screw and nuts.
The stone dimension is 13x25x100 mm.

Update 1:
For the table, i use a piece of komatex with 8 mm neodium magnets. In my opinion this is the best solution, because you can move the knife if the blade is curved.

Update 2:
For angle setup: put the knife on the table, put the stone on the knife blade and adjust the angle by moving the vertical stand. The upper mark represent 10 degrees angle (the big triangles is 10, 20, 30)

Update 3: I modify the back main stand to be printed without suport, and the lenght of the front main suport to be more stable.