Find the right demo build
Shield Generator Mk. 1 is a defensive module introduced in the October Next Fest demo update. If the module is missing from a guide or a build list you're comparing against, check the game version before you change your ship design. Earlier demo references can predate the module.
Build around the job the ship has to do
Decide which ship will take on defensive work before making room for the generator. A ship that escorts cargo or responds to an attack has a different job from the ship you use to haul ore. Keep the propulsion and weapons that let the defender do its job, then compare how much room remains for protection. Try the layout on one ship before applying it across your fleet.
Check requirements in your build
The developer's October demo update introduces the module alongside other ship and station additions. In your current build, read the module and research entries before committing resources. Placement, recipe, and performance are the details that determine whether the generator fits the design you're working on.
FAQ
Is Shield Generator Mk. 1 part of the October demo?
Yes. The developer specifically names it in the Next Fest demo update.
Should every ship carry one?
Start with the ship most likely to encounter combat. That gives you a design to compare against your cargo or mining layout before changing the rest of the fleet.
Where should I get the build cost?
Check the module entry in your version. The update announcement establishes that the generator was added but doesn't list its cost.