You're welcome. I was curious myself and just decided to do it. Thing is, even if Stack isn't listed on a geometry chart, sometimes fork crown to axle center and/or fork rake aren't listed. Now most road bike forks are in the 375mm range for crown to axle dimension and about 45mm rake...Roubaix fork has a bit more rake to reduce trail with 72.5 deg HTA so just a bit different.
I hope others post their stack calculations based upon the crib sheet I posted.