While building partwork models, we will always find ways to improve them. While our own custom modifications can make a big difference, there is also a small group of mod producers out there who do it for us! This list includes a link to the products I have used from many of them,  but take note it is not a full list of every possible modder that exists in our community:

Mike Lane

Model Modz

Scaled Modz

Darren Gurney

Bill Will Green

Rallbart (Rafael Lin)

3Dynamics (Adrian Dinca)

Rail-Road Models UK