Planierrahmengewicht

There isone of two reasons why texture flicker... One is that texture file isn't squared number... 2 4 8 16 32 64 128 256 etc
so file of texture should be for example 128x128 pixels or 1024x256 (I hope you understand what i wrote).
Second possibility for 'flick" is that you have 2 textures on same place so they collide themselves.
There is also couple more possibilities but those rest are unlikely to be in your mod because is small and plain mod with just couple materials.

Anyway good job and keep modding you will be better with more trying and practice. No one is born with knowledge :)