Just found this thread, wow, super nice work!
I am in the planning and parts gathering stage of building Grandpa's 1957 GMC LCF onto a P-32 chassis nearly exactly like yours. Was shocked to see you revamp all that steering box fabrication work and go with a R&P.
Could you explain what the steering geometry issue was? I was planning on replacing the motorhome box with a G-Series Van box in place of the driverside idler motorhome thingy. Now you have me scared....
(my motorhome steering box is exactly like yours, by the way. There were two versions from what I have been learning.)