pleasedThis afternoon (after spending the morning at PenWAG) I essayed an attempt at my first ever fall-front on said trousers.
Much to my delight, the geometry of the pattern pieces made complete sense and it went together properly the first time!
What's left: attaching the waistband (which has been assembled to the ready-to-attach point), inserting the rear inset, adding the fasteners (buttons, buttonholes in front and eyelets in back), and then hemming the legs (which are already pressed to the right length).
I have to thank Tamara Schirrmacher, who custom-graded the pattern for me from an old pair of US Navy 13-button sailor pants she deconstructed some time ago.
Pics once the waistband and fasteners are on, which should be complete tomorrow!