If you're getting a duplicate asset error, it means you already have a mod that's applying those same items. This mod does not add any items and only patches the "universe_server.config" file with the following:
{ "op": "test", "path": "/speciesShips/spirittree"},//Checks to see if race is installed
{"op":"replace","path":"/speciesShips/spirittree/0",//Command to replace default starting ship config
"value": "/ships/fu_byos/fu_byos.structure"}//The starting ship config to use instead

Does not support with FU. Here is the error:
[Error] Duplicate projectile asset typeName spiritdoublebolt. configfile /projectiles/guns/arrows/spiritdoublebolt/spiritdoublebolt.projectile
[Error] Duplicate projectile asset typeName spiritpentabolt. configfile /particles/guns/arrows/spiritpentabolt/spiritpentabolt.projectile
[Error] Duplicate projectile asset typeName spirittriplebolt. configfile /projectiles/guns/arrows/spirittriplebolt/spirittriplebolt.projectile
[Error] Duplicate projectile asset typeName spiritbolt. configfile /particles/guns/arrows/spiritbolt/spiritbolt.projectile
[Error] Duplicate projectile asset typeName spiritboltexplosionknockback. configfile /particles/explosions/spiritboltexplosion/spiritboltexplosionknockback.projectile

When I installed the mod, I thought it would just add an Spirit Tree Ship option to the frackin ship section, since it is already in FU, could you possibly code this in? I would much appreciate having a Spirit Tree BYOS ship with added blocks and decorations based on the vanilla design. If you don't have the time, patience, or just don't want to do it, that's fine with me, just please let me know.

@Glaxo17 I just confirmed the mod is working as intended. To select the BYOS option, speak to Sail after first entering your ship (after tutorial or after you have created your character) and select the "Frackin' Ship" option. The mod turn your starting ship into a rusted-looking BYOS model if it is functioning correctly.

It isn't showing up at all.