Geoff, As a huge '57 BelAir (and former owner of one as well as my Dad being an owner of 2) fan you have nailed this build both in terms of quality of workmenship and accuracy. I do have to tell you though, the under chassis sheetmetal on most true restorations I've seen are red oxide though I have seen some painted body color or black. Please don't take this as a criticism, just pointing it out .
At any rate, yep that paticular model has some madening issues.
Looking forward to the completion, beautiful job!!!!!???