Although I'm not really interested in prebuilts, this FILCO Majestouch 2 (brought to my attention by voodoo6k) with its impressive weight, brushed steel top plate, heavy-duty adjustable foot and dedicated handle is the exact kind of prebuilt I like as a source of inspiration.
We all know how embarrassing a lightweight keyboard can be. Accidentally tossing your keyboard around on your desk is definitely not an issue with this beast weighting 4.385kg.
The already hefty case built of 1.2mm thick bent steel is covered by a 2 mm thick extra plate serving as a wrist/palm rest. With these parameters, this one beats even my Reuters trading keyboard – which is already much more heavy than needed.
To carry around such a keyboard a dedicated handle is probably a must.
