Week 8 - Challenge 1 - Base Bracket Design

QUESTIONS REFARDING THE METHOD FOR ABOVE CAD IN #35 VIDEO:

1. WHY SYMMETRY NOT USED FOR RIB 2 ?

2. WHY CONSTANT FILLETS OF 5.5mm USED AROUND RIBS IN CLASS B SURFACE WHEN SOME OF THEM WERE INSIDE AS WELL AS OUTSIDE EDGES w.r.t CLASS A SURFACE.

FOR INSIDE EDGES 3mm-2.5mm =.5mm OF FILLET BE GIVEN AS SHOWN IN BELOW IMAGES ?