I bent one fuselage channel (F24-05), first. It didn't have a "critical" width, so I did this one first, but it came out to the perfect width!
So I went to two "critical" width pieces (I call them critical because they are empenage ribs that must match the other form-block ribs in width, and also so the pre-cut skins will fit. Both pieces [T03-04 (x2)], came out perfect!
Here's the first long channel I bent with the brake