I've built a bookshelf that is basically just glued wood with notches cut in:
With the vertical struts 50cm apart, this is ideal for just about anything: it nicely fits 40cm Euroboxes and 19 inch electronics.
Now I'd like to do the same again, but 60cm deep, and with a builtin desk. The desk should fit two monitors and a laptop, so it needs to be 2m wide, which will require me to leave out three vertical supports, or at least cut them back quite a bit. The desk should be at 30-35cm height, so I can sit on a cushion on the floor in front of it (the entire room is laid out with tatami, and so far I've been working on a 30cm high table, that seems to work fine).
My current idea would be to cut the vertical boards back to 10cm width inside the cutout, and add a small, 20cm deep, bookshelf above the space that is still recessed inside the nook, so the vertical boards would look like one of these:
This is pretty much optimal for my storage and work needs, but I don't quite trust that it will be stable enough, because the overhang will not be able to carry a lot of weight and there is no vertical stabilization in the back -- basically the entire weight of each row is carried by the front part and needs to be transferred to the back where there is a continuous connection to the floor.
Can I sensibly add horizontal supports below the bookshelf and the lowest full-length row, or will that just bend as well and not significantly take load off the weak points?
My idea here would be to fix a horizontal slat, possibly from some harder wood than the main construction, near the front to support the weak points, and anchor it on the sides (where there are no cutouts, just slots to slide in the horizontal shelves). Is that feasible?
Second, this might need stronger attachment to the wall than the original shelves (which carry all the weight on their own and just need to be kept from folding up sideways or falling over). The wall this would be up against is a load-bearing brick wall. Should I add more anchor points near the top here, and basically expect that there will be more of a pulling instead of a shearing force (so longer pegs and screws), or is that useless?
Does it make sense to switch up the wood type here for more strength (the current ones are fir/spruce) or does that introduce other issues I'm not aware of?
Should I waste a bit of space and leave 15-20cm remaining (basically, the monitors are 60cm wide, so the remaining bits on the vertical supports define how far back I can place them)?
Any other ideas I might have overlooked?