Give this a try...it should get you pretty close and then you can do your static testing to get the optimum spacing. The blueprint for this blank has not been finalized yet and these guides and spacing are preliminary results and may not be what gets published.
Is this your first switch build? How do you like the blank so far? I've been neglecting my overhead casting in preference for double hauling my switch.
Guide order from the tip top Guide Guide Placement - In inches from the tip top 1st XTCHSNGP3 4" 2nd XTCHSNGP3 9.375" 3rd XTCHSNGP3 15.5" 4th XTCHSNGP3 22.75 5th XTCHSNGP4 31" 6th XTCHSNGP4 40.5" 7th XTCHSNGP5 51.25" 8th XTCHSNGP5 63.75 9th TIMXNZG12 78" 10th TIMXNZG16 94.25"