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 this is not a full list of every possible mod maker that exists in our community:

Mike Lane

Model Modz

Scaled Modz

Partwork Upgrades

Darren Gurney

Bill Will Green

Rallbart (Rafael Lin)

3Dynamics (Adrian Dinca)

Rail-Road Models UK

My collection of large-scale partwork model build sites