A "Laptop" with desktop power? Monster ITX (M) is my answer.
Monster ITX (M) is a console ITX case, specifications:
-Inner dimensions: 332x212x64mm.
-Support ITX motherboard, 170mm (PSU inside) - 211mm length (PSU outside) graphic card.
-CPU cooler height max : 50mm.
-Support many PSU solution:
Fully inside AC/DC + DC/DC board up to 350 W.
AC/DC outside adapter + inside DC/DC board.
-Support 4x60mm (10mm thick) Fan.
-Support 4pin ATX power cord and a 4pin to standard AC cord cable.
-Material: Aluminium, Carbon steel or Stainless steel.
-Structures: 2mm metal sheets, connected by special hook method. Unique design.
-Finished: Sand blast, powder coated (carbon steel).
-Color: black and white for aluminium and stainless steel, many color for carbon steel version.
3D models:
350W-12V solution installation:
300W-24V PSU solution installation:
I hope this will be good choice for you in many available ITX cases.