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While its firmware was used unchanged from lcd2usb, the hardware was simplified by removing the programmable contrast control, support for multiple display types and for in-system programming. Another change was necessitated by the fact that the display used (a JHD204A), while claiming to be HD44780-compatible, has its contrast and Vcc pins (2 and 3) swapped.
The circuit was assembled in typical 'backpack' style on a piece of stripboard. A nice feature of this display is that it provides connector pins at the top and bottom, allowing functions to be connected to whichever edge is most convenient. The layout was performed manually with pencil and grid-paper as shown below.