Interesting dimensions on the FPH2. I don't know the source but assuming they are correct that would give:
Width 254mm
front to back 241.3mm
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Keegan put up some measurements from the actual PP2 a while ago and gave the dimensions as:
Width 240mm
Front to back 267mm
That would mean the FPH2 is too wide by about half an inch and to shallow by about one inch.
Keegan also gave PP2 mandible measurements of LM 147mm and RM 150mm but you'll have to get someone with a FPH2 to take those for comparison. When I had my FPH2 many measurements were in the GMH range so you may have mandible dimensions in the region of LM 142 and RM 140 (Keegan's numbers) but I no longer have both to hand so this may well be incorrect.