Hi Stocks
Welcome to the madhouse
As for the Math no chance I'm afraid I use the tried and tested Peco tracksetta templates
or the other method see what its and check the gap is wide enough for OO to pass without touching
That will be another problem you encounter OO scale has a gauge of 16.5mm but if you check out the true gauge for 1/76 you will find it's 18.2mm so all your calculations will have to take that into account (OO is a lazy man's scale as the rail gap is true scale for HO scale)
Like I said welcome to the madhouse
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