Slating around window openings on vertical dormer face

[c0wb0y]

Hey folks - I'm curious as to how the pros would finish slating around a window opening on a flat dormer face? These are vertically hung fibre cement slates and I'm wondering if a basic corner trim could finish the job so the edges look neat? Would you recommend a plastic trim or aluminium? Glued/Silicon'ed in or capped nails? Is there a contraption available for this sort of stuff?

Also, how would you finish off an external corner where the face of the dormer meets the cheeks? The same 'L shaped' profile?

Any advice would be greatly appreciated.

 

[datarebal]

use alloy soakers

 

[c0wb0y]

bump - specifically on how to finish off an external slated corner?

 

[datarebal]

Alloy soakers, close mitre the slates