I finally got around to putting all the files together in one place, so here they are:
AH_Meter_Files.zip
The .sch and .pcb files are DesignSpark. The source code files are compiled with CCS C compiler running under MPLAB V 8.88 and the .mcp file is the project file for this.
You can make a 255 A version by changing to a Tamura 200 A sensor with some other minor changes.