Alcove corner shelf-units (DIY) (Central Crouch End N8)

305mmL x 225mmH x 205mmW
Could fit any alcove, though built for each side of a bed within it, with screwholes to fit to the wall. They were, however, deliberately constructed to fit a particular alcove which wasn't square on one side, so neither is that unit: see the second attached image, viewed from above. Consequently the vertical edge is unlikely to be flush with the wall. Unless of course one of your alcove corners happens to be similar....