Description: From IKEA:
5 large BILLY bookcases (80x28x202 cm) and 10 BILLY top bookcases (80x28x35 cm).
Removed every second vertical wall-side and drilled out holes to fit shelves/screws/etc on both sides.
Put together the 5 big bookcases first, placed wires on the back before mounting it to the wall. Once stable the smaller top cases were placed on top. The leftover wall-sides were used to fill the gaps around the bookcases and wall/ceiling.
Once done the light was added, vertical room “room separators” were cut to fit and a floor panel was added at the bottom.