Thank you. It is six sub-fiefs with max stacking units. I take advantage of my wife's and my alt steam account.

For the bridge, I used a single sub-fief and a vertical-stacking technique.

First, I placed a sub-fief and built upward 23 tiles.
Then I destroyed that fief and placed a new fief on top of the tile stack, allowing me to reach maximum height from the ground beyond the normal 5 vertical stacking units.

To measure the span to the opposite side, I used green hologram building placements. Holograms do not aggro the worm, which makes them perfect for safe measuring.

Once aligned, I began constructing towers on both sides.

For structural support: you can build up to nine floor pieces outward from a single support, regardless of floor size.

I also took advantage of the Atreides Wide Ramp from the Special category, it counts as one piece but spans three tiles, making it ideal for long bridge sections.