The LVL23 is the default first bartop build for a reason: pre-cut, routed and pre-drilled MDF panels sized for up to a 23-inch widescreen, with the control panel orderable in HAPP or Sanwa layouts. You supply the monitor, controls and a brain (Pi, Pandora’s Box or mini PC).
It is the best-documented kit in its class, which matters when it is your first build.