Trellis on top of wall

[Donetello1561]

Trellis is secured by brackets to the top of the wall,the wall has a stepped up part approximately 12 at a 45 degree slope,I’m guessing around a 45 degree slope,how do you calculate the angles that the trellis needs cutting at so it maintains the same width across the full length of the wall

 

[foxhole]

Horizontal sections end with post then just cut is angle section.

 

[Donetello1561]

Horizontal sections end with post then just cut is angle section.

No posts,just fastened to top of the wall.cant cut just the middle piece as it then becomes wider than the other two pieces.
I was thinking find the angle of the wall slope,two hacksaw blades fastened together then flip this vertical and cut the three pieces at that angle?.

 

[Odds]

No posts?
No way.
How is it afixed to the wall?

 

[Donetello1561]

No posts?
No way.
How is it afixed to the wall?

90 degree angle brackets

 

[foxhole]

90 degree angle brackets

Will blow down first stiff breeze, needs post at end of every section .