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Aftermarket housings are a relatively recent innovation in the HHKB world. This is due in part to a couple of reasons:

  • Stock HHKB cases integrate the plate and slider housings into the case itself, and OEM slider housings and plats are not sold separately
  • The cost of machining a case with integrated plate and housings is astronomically high

That hasn't stopped a small community of aftermarket case designers from attempting (and recently succeeding) in creating custom cases, mainly for the Happy Hacking Keyboard Professional 2 ANSI line.

Norbauer & Co.

Norbauer & Co. is an industrial design studio run by Ryan Norbauer. that produces, among other things, "high-end, holy-grail [...] machined metal housings for computer keyboard modders." (source)

They're known for unique, high-quality keyboard housings utilizing uncommon finishes and designs.

Heavy Grail

The Heavy Grail is a Happy Hacking housing that comes in three aluminum variants (K2, a textured white finish; Aperture, a heavily-textured grey finish; and Sunset Blvd, a matte pink finish) as well as a stainless steel model (Veracity Steel).

The plate is a fully custom design manufactured from ABS plastic (the same material as most or all of the Happy Hacking Keyboard Professional line) that incorporates the slider housings, so the kit is complete when combined with a compatible keyboard. The plate was manufactured in both black and pink variants for this release.

There are separate versions of the kit that support the HHKB Professional 2 (which removes access to the USB-A ports) and the HHKB Professional Classic, with additional limited support for the Professional Classic Hybrid series (without battery support, which means the keyboard needs to be attached via the USB-C port for power). In addition, the Professional 2 model does not provide access to the DIP switches, but the Professional 3 model has a cutout on the bottom to access the DIP switches.

A few other unique features of the Heavy Grail case, in addition to its industrial design, is the Poron PCB gasket system and a merino wool felt sound dampener that sits below the PCB inside the case.

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Heavy Grail: Ghost of Christmas Future Edition

A limited final batch of the Heavy Grail series made from frosted polycarbonate with a textured white rear bottom plate.

This version of the Heavy Grail was only produced in a single run, and only supports the Happy Hacking Professional Classic (with limited support for the Hybrid model - see the details above).

This version also uses the same black or pink plates with an additional option for a white plate, also made of ABS.

All other details and accessories included with the kit are identical to those included with the original Heavy Grail line.

Heavy Grail: Ghost of Christmas Future Edition Heavy Grail: Ghost of Christmas Future Edition Heavy Grail: Ghost of Christmas Future Edition Heavy Grail: Ghost of Christmas Future Edition Heavy Grail: Ghost of Christmas Future Edition Heavy Grail: Ghost of Christmas Future Edition

Noxary Works

Noxary Works is a keyboard designer most known for their MX-compatible keyboards and cases. Most of their designs are made from aluminum using CNC manufacturing and are limited to small runs.


The Evija is a 'seamless' case design (the top and sides of the case are a single part) with a top-mounted plate and a separate base. A complete Evija build weighs 1375g.

Released on 31 July 2020, the case and base are manufactured from either aluminum or polycarbonate, with plate options in aluminum, polycarbonate and brass.

40 aluminum units and 10 polycarbonate units were produced. Colors available for aluminum cases included Lightning Silver, Blue Gray and Jet Black (manufacturer's terms). The plates were available in Lightning Silver (aluminum); sandblasted, clearcoated brass and frosted white polycarbonate.

In order to build a complete keyboard, a PCB, daughterboard, rubber domes, conical springs, spacebar spring and keycaps from a Happy Hacking Professional 2, as well as slider housings and stabilizers from a Topre Realforce R1 keyboard are required in addition to the kit.

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Photos courtesy of Noxary Works

Evija HG

A even-more limited edition version of the Evija, the Evija HG variant includes a unique stainless steel base instead of the aluminum or polycarbonate base. A complete Evija HG build weighs approximately 2920g, more than twice the weight of the Evija.

This model also omits the USB-A ports, unlike the Evija. It was released in Lightning silver.

10 units of this case were released on 17 March 2020.

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Photos courtesy of Noxary Works


Drop is a company that runs for-profit group buys across a variety of enthusiast communities.

HHKB CNC Aluminum Case

This case was designed in 2015. Only a handful of prototypes made it out of the concept phase, but as far as I know, the group buy for this case never met MOQ, so it was never widely produced.

It was reviewed poorly by community members who had the oppurtunity to test it, with complaints including poor manufacturing tolerances, undesireable sound quality and a general dislike for the design.

An interesting note is that while the slider housings are built into the design, they're manufactured from the same piece of aluminum as the rest of the top case, which could lead to rapid wear on the sliders themeselves.

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