I'll vote for the straight up and town vertical line.

It matches the verticalness - izzat a word? - of the windshield and continues the theme.

Plus it gives you a rectangular opening that fits well.

If the tops bottom connection to the body is where shown in the pics, looks like you'll have lots of elbow room.
I'm guessing with your arm tipped up to rest on the upper part of the door, you'll get tired of that after a while and bring your arm inside.
Sorta what happens with my 32....