RE: #2
Can you clarify what you mean by
“make one layer only apply”
If you want a texture to apply only to the fillet you can apply the texture to the extrude nurbs, then select the texture tag and in the attributes manager type R1 or R2 into the SELECTION area. R1 being the front fillet and R2 being the back fillet.
You can also enter C1 and C2 which will apply it to the front and rear caps only.