its' a valid question. Definitely annoying when long posts throw the fitment off. I don't have the ballpark number, but your question prompted me to start prepping my Hyrax. I make my holes based on the distance between the posts (I'm using the 88mm configuration per the manual) and the distance between the front axle line and the body posts (50mm. Note: I was running 4 degrees of caster and about 1.2 degrees toe out when I calculated 50mm).

I usually use the process on the the Twister Sp. So, this was the first time on the Hyrax.

First, I lay in the axle line which goes up and over the wheel wells and across the hood




In the picture below, I used the grid on my cutting mat to define two points I can use to draw the axle line on the hood.



Once the axle line is drawn, I can find its center using a reference (I'm using the seam lines)


Half of that is the center.


I create another line using the seams as a reference, and find the center of that line.




The Hyrax has a convenient bump in the center of the hood. We can draw a line from that to our center point.



From the axle line to the body posts is 50mm (caster and two can affect thiss.


I draw the body post line through the 50mm mark. The body post holes will be on this line.


I made a template that I can overlay over the body post line. it makes it easier to mark the drill points. Without it, I would simply extend my body post line further and mark drill points 44mm off the center line in both directions. (Again, that based on how my body posts are installed. there is an 88mm configuration and 76mm configuration)



Arrows mark the drill points.