Well, I can't hand off any TC-specific tidbits, but after re-aassembling the '51 TD a few times, I did learn a few lesssons the hard way.
The bonnet structure on the TD does have a bit of a slope, created by the use of the hood strip inner support (part #13, p32, Moss catalog) which lifts the bonnet hinge a tad. Big lesson I learned is to not tighten down fender, bonnet, and radiator stay bolts initially. Nothing on "T"-series chassis has a precise fit, so you've got to assemble it, stand back 20', adjust the fender this way, the radiator that way, etc, until it looks right. Then cinch things up.
I like your idea of leveling the chassis. The car will likely end up with a truer assembly then the day it rolled out of the Abingdon factory! 