47-55.1 Steering column placement

[R&B51]

51 3100 recessed firewall for LS clearance.
Working on planning pedal assembles and steering column placement. Constrained some by lower edge dash (could possibly delete shift linkage notch and at same time create centered larger bore notch to allow moving column higher at dash) and recessed box in firewall. Top of firewall box is 15” off level cab floor.
Initial look suggests hole through firewall higher than original hole resulting in sort of more horizontal plane of column angle. My little Wixie digital angle gauge says I don’t alter I can make about 21° downward slope probably if I notch the dash for the column may be up to 27° downward slope of the column through firewall.
Willing to go with tilt (I think they tilt maybe 15 degrees up and down)tilt and telescope Ididit type column to allow some up and down. Firewall shaft penetration understood to need to clear engine on bay side.
Some questions:
-Opinions or experience range of reasonable and safe angle column goes through dash?
-Experience on range the plane of steering wheel is distanced from dash in use?
-your preferences on wheel diameter and clearance from legs?
-related question, using a 1990 Chevy truck bench seat that I will cut 4 inches out of width-wise. It has a base under that I may need to adjust the height on to get seat height right. Do you guys have a general range on how high the seat or the bottom of your legs are off the floor for good comfort? How many inches up through the windshield does your visual plane level out at? Cab just sitting on a dolly so hard to picture of the rest of the truck around me. I am 6’ 2”, size 13‘s and the seat feels like it’s far enough back, just enough foot room but I just don’t know what seat height is good for me and other drivers who might be using the truck. Obviously impacts where the steering wheel sit comfortably as well.
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