Neat mounting of custom built-in shelves in kitchen?

[klarken]

Hello!

I'm working on my first renovation and trying to do most of it myself, scary and incredibly fun. I have a kitchen of about 3.5 sqm, so it has really been a challenge to plan smartly, but I'm now in the final phase and feel quite satisfied. However, I've gotten stuck regarding how to attach some open shelves and some open "shelf boxes" I plan to build under the kitchen cabinets, so here comes a whole bunch of (probably unnecessarily cautious) questions before I dare to start.



Regarding the open shelves, I'm thinking I can screw shelf supports/lists at the ends and wonder if that will work, would be nice to avoid ugly brackets.
- I'm considering shelves in plywood, pine, or MDF. I've checked Sagulator, all should work but I'd appreciate warnings if you have any.
- I'm going to lacquer the kitchen cabinet doors, will I go crazy with the difference if I don't lacquer the shelves as well but paint them myself?
- On the left side, screw directly into the IKEA frame (Metod + cover panel = 2x16mm), alternatively screw and nut?
- On the right side, screw directly into the lightweight concrete wall with ESSVE lightweight concrete screw. Length recommendations?
- What dimensions and material do I need for the lists? And how many screws per list?
- I want the lowest shelf at the same height as the shelves under the upper cabinets, but the fan is on the left side. Will shorter screws (list + 10mm) be enough, can I compensate with more screws than the other shelves that can have longer screws?

For the upper cabinets, I thought to secure them with IKEA's Metod hanging rail, but I'm worried they might fall since the walls are quite poor... Will lightweight concrete screws work here, or is some form of chemical anchoring required? How closely should I space the screws?

I also want to attach the shelf boxes under the upper cabinets as invisibly as possible. They will hold porcelain, so I'm afraid screws won't be sufficient as they would be so short, the cabinets will be max 30mm thick together. Can connection fittings withstand the pull (thinking as an alternative to screw and nut with two flat heads)? Angles against the wall?

Deeply grateful for all advice! Trying to think of everything and, as mentioned, it's the first time I'm renovating; I want to make sure it holds, hence the double suspenders and triple belt questions, hehe.

 

[sinuslinus]

Strips under the shelves are a good idea. You can also put one at the back edge to reduce sagging.

Attach a board to the wall on the right to which you screw the support strips. You won't have sufficient precision with the anchor holes in the lightweight concrete wall to attach the support strips directly to the wall.