Most likely thing is about design of springs. To making spring with turned extended head is quite easy in ZW3D that's why my work is going to be too easy.
It's little bulky software but not much flexible to transfer one workbench to another workbench. I mean it suppose to be like quite CATIA v5.
Improvement required in GUI.
I designed suspension system in ZW3D and it's tough to modify beyond the assembly so it is compact but not flexible.