So I've created a custom planet type, selectable from the custom faction creation menu. The planet is selectable and loads, but I cannot give it an icon. I've tried multiple different names and file structures, but I cannot get it to use the icons. Here is my file structure:

HomePlanetsUnlocked.xml

---

    <Plugins>

      <DatabasePlugin DataType="Amplitude.Unity.Gui.GuiElement, Assembly-CSharp-firstpass">

        <ExtraTypes>

          <ExtraType DataType="Amplitude.Unity.Gui.ExtendedGuiElement, Assembly-CSharp-firstpass"/>

        </ExtraTypes>

        <FilePath>Gui/GuiElements[HPU].xml</FilePath>

      </DatabasePlugin>

  </Plugins>

Simulation\FactionTraits[HPUMajor].xml

---

  <FactionTrait Name="FactionTraitHomePlanetPlanetTypeTerrans"      SubCategory="HomePlanet"    Hidden="true"   Custom="true"    Cost="20"  IgnoreForTraitsCount="true">

    <SimulationDescriptorReference Name="FactionTraitHomePlanetPlanetTypeTerrans"/> <!--For Home Planet colonization-->

  </FactionTrait>

Simulation\SimulationDescriptors[HPUFactionTrait].xml

---

  <SimulationDescriptor Name="FactionTraitHomePlanetPlanetTypeTerrans"       Type="FactionTrait"/>

Gui\GuiElements[HPU].xml

---

  <GuiElement Name="FactionTraitHomePlanetPlanetTypeTerrans">

    <Title>%FactionTraitHomePlanetPlanetTypeTerransTitle</Title>

    <Description>%FactionTraitHomePlanetPlanetTypeTerransDescription</Description>

    <Icons>

      <Icon Size="Small" Path="FactionTraitHomePlanetPlanetTypeTerransSmall"/>

      <Icon Size="Large" Path="FactionTraitHomePlanetPlanetTypeTerransLarge"/>

    </Icons>

  </GuiElement>

Resources\

---

FactionTraitHomePlanetPlanetTypeTerransLarge.png

FactionTraitHomePlanetPlanetTypeTerransSmall.png