So, I've installed the force fields and now my defense line is a coat of paint from being finished.
Since the Dual Pylon Fields are just a bit wider than a long section of the defense line, I will have to be careful to ensure that I overlap them appropriately. And also not to allow cover saves outside the vertical portions of the pylons. The small portion at the bottom is decorative only.
In the picture below, you can see that when the Single Pylons are placed in the gaps between the Dual Pylons, the size is virtually the same.
I'm thinking blue ink for the fields, and painting all but the field projectors in the stipple pattern of my tanks.
Update, here's a reject piece in the proposed paint scheme:
I'm not sure I like how the blue ink works on the force field.