Dea Dia changes the recipe category for Low Density Structures from "crafting" to "heating-or-assembling", which prevents hand-crafting LDS. Was this an intentional change or an oversight to prevent hand-crafting, as it's a big pain when trying to make landing pad storage extensions on new planets.
This also affects Planet Parcelsin's mechanical-plant, which uses the "mechanics" crafting category. Parcelsin adds Mechanics as an additional crafting category to LDS without overwriting so LDS remains hand-craftable. (They made a function "add_additional_categories" in their data.lua)
Thank you for your time.