Nice write-up and a nice outcome, but speaking as a reasonably successful home/amateur woodworker, this is very over-thought and over-engineered. I say this not to criticise the creator as I appreciate that they are new to this, but to help others considering such pursuits.

Some constructive feedback:

* There is no need for the extruded aluminium frame - some cheap wood would have sufficed as a frame

* The CNC'd hanging brackets are totally unnecessary - a couple of holes, one either side, with a keyhole hanger over each would have sufficed

* The balancing and 3d-printed endcaps is unnecessary assuming you've got reasonably well-placed hangers

* The fancy ESP32 board could have been replaced by a commodity ESP8266. (You could get rid of the ESP altogther and just buy pre-wired LED strips, but then you lose the opportunity to program nice lighting effects.)

As a result, the bill of materials is multiples of what is could have been. I estimate that you could replicate this in a single weekend for ~80-85 EUR (15 EUR countertop, 10 EUR wooden frame, 5-10 EUR plexiglass, 40 EUR LEDs + PSU, 5 EUR ESP8266, 1 EUR for two keyhole hangers) assuming you have a few screws and some wood glue available, plus whatever the cost of the markerspace is. Everything could be sourced from your local DIY store, plus an order from Aliexpress for the electrical components.