geometry puzzle: frogs in a dualgauge turnouts

I'm just creating a CAD drawing for a #8.5 dual gauge turnout.

Independent of 3rd rail position, the distance between the NG Point of Frog and SG PoF is about 4459mm (14.63'), so two unmodified 15' frogs
won't fit.

Does anyone know how this problem was solved? I would assume, that the SG frog would be normal, and the heel of the NG frog shortened?

Btw. the 3 gauge turnout on display in Antonito is a bit odd:
I've measured the SG frog to be a standard 15' frog (toe: 6'5 1/4"; heel: 8'6 3/4") but the NG frog to be even longer (total 5.07m, toe: 2.27m) instead of shorter

But this whole turnout looks to be sledgehammered until it fits: there is a significant bend in the SG frog, the turnout looks like a left hand turnout, but the stock rail bend indicates it's a right hand turnout ...

Christian