Integrating a Pull-Out Keyboard Tray and Monitor Mount Into a Custom Cabinet

A pull-out keyboard tray on full-extension runners sits 60–80mm below the desk surface — at a height appropriate for wrist-neutral typing rather than the higher hand position required by a desk-height keyboard. The tray should be 600–700mm wide and 250–300mm deep, providing space for a keyboard and a compact mouse pad. The mounting rail for the tray must be fixed into a solid horizontal structural member within the desk carcass — not into the underside of the desk top alone, which will flex. Blum or Hettich full-extension runners of appropriate weight rating are specified.

A monitor arm clamp mount requires a desk edge or a through-surface bolt mount — both are cleanly integrated into a built-in desk if specified at the design stage. For a through-surface mount, a 40mm × 40mm solid hardwood reinforcing block is laminated to the underside of the desk surface at the mount position. The monitor arm bolt passes through the desk top and through the reinforcing block, distributing the load over a larger area. The benefit over a clamp mount is a cleaner desk edge appearance and the ability to position the arm anywhere on the surface.