Recycling: Recycling parts with the dmp friendly code will not cancel the build order in PHost.
Hulls Recycled: When a base is destroyed during combat or because the planet becomes unowned, all hulls are destroyed along with the base. When a base is given away or conquered in ground combat, hulls are recycled normally.
Tech Downgrades: When HOST downgrades a starbase because the player is unregistered, it will return the money. PHost does not do that to prevent people from trading Tech for cash.