Not sure what you mean by shuttle remaining the same? But it maybe the code is looking only 1 shuttle. In mine it can do different shuttle meshes based off the OV number. Always looking for testers.
============================ ERROR: ===========================
Mesh not found: .\Meshes\2016SPACESHUTTLE\Discovery\DiscoveryORG2016f.msh
[MeshManager::LoadMesh | .\Mesh.cpp | 1238]
===============================================================
000000.000: ET: Config File: D:\Games\Orbiter2016\Config\Multistage2015\Space-Shuttle_STS-Endeavour.ini
000000.000: >>> ERROR: No vessel class configuration file found for:
============================ ERROR: ===========================
OSTA_1
[Vessel::OpenConfigFile | .\Vessel.cpp | 243]
===============================================================
000000.000: >>> TERMINATING <<<
============================ ERROR: ===========================
Mesh not found: .\Meshes\2016SPACESHUTTLE\Discovery\DiscoveryORG2016f.msh
[MeshManager::LoadMesh | .\Mesh.cpp | 1238]
===============================================================