In every early design state we work with a single part file (multibody).
Later we then create the parts and place standard components gears / engines and so on to this layout.
What we miss is the possibility to create inside the first part profiles like tunes and Steelprofiles and change the size easy.
At the moment we work with a scetch block lib but changing is a pain.
The biggest goal will be when we can create table driven Ifeatures per profile type.
This works like a charme but Ifeature can not create new bodies 😞 ??
This as a option and the game will change 🙂
Another way can be to make the Content Center Elements table driven.