Hey,
I don't think you can replace the TXD.
What you can do is load your textures as shader replacements. A basic shader will let you wrap an image around an existing texture.
https://wiki.multitheftauto.com/wiki/EngineApplyShaderToWorldTexture
Your thread has been moved to the Scripting forum for best results.
UPDATE:
- Updated [TDM] Italy
- Updated Server to 1.5.8
- Added new lighting method with huge performance boost
- Fixed time locking up forever after playing certain maps
- Removed dr_blendshad
- Temporarily disabled shader_detail
- Some other small improvements and bugfixes
- Disabled voice completely