Some small change to let you use the Archean Tree in your Gravship.
You can extract the Archean Tree.
You can build a "soil" floor (unlocked by Tree sowing), that the Archean Tree can change into a "rich soil" floor.
The Archean Tree won't change the soil to rich soil anymore but instead it will add a "rich soil" floor on it.
Know error :
When you build a gravship substructure in the the Archean tree range, it can add a rich floor before you finish to build it, it create an error that prevent the substructure to by build.
(so extract the Archean tree if you need to build gravship substructure in the tree range)
