1 - it would be madness to try to cut the vertical supports so precicely - just make them all 202 and the screws/glue will pull them all together?
2 - it will attach to a wall on the LHS, so, three screws in there. What about at the back? A 20mm square baton screwed into the wall then hang the shelving off of that. One baton, or one baton per shelf?
would be madness to try to cut the vertical supports so precisely
Not at all. 6mm is a huge difference, especially for a cabinet. How are you cutting them? What's the reason for the difference?
If you can make it so all the uprights are the same I'd do that,
making this, to go on the wall, for storage jars.
1 - it would be madness to try to cut the vertical supports so precicely - just make them all 202 and the screws/glue will pull them all together?
2 - it will attach to a wall on the LHS, so, three screws in there. What about at the back? A 20mm square baton screwed into the wall then hang the shelving off of that. One baton, or one baton per shelf?