Best method of fixing soffit and fascia to new roof?

[ruggers]

Whats the best way to secure a 200mm horizontal soffit board and a fascia to 400 centre trusses.

The rafters are 35mm wide and 150mm long on the untrimmed plum cut ends.

 

Would I be better off installing a 150 x 25mm treated sub facia then add 18mm fascia or capping board over it for a better finish and more secure?

 

I have 205mm soffit detail on the horizontal runs plus the gable ends. The soffit will butt up against the outer of the facing bricks as theres 2 courses of brick over the window lintels.

 

What are my options to fix the soffit too? Would I screw a horizontal 4x2 to the side of each rafter 205mm long and then nail the facia into these?

Or, fix a vertical 4x2 to the rafter with it up against the facing brick to nail the soffit into? This would mean nailing into end grain which isn't as strong.

[jack]

(Moved as requested by original poster.)