In UE, I generally design custom Actors that have a several skeletal meshes or static meshes. The class has floats/ints/enums/etc. that usually transform one of the mesh components.
For example to make a UEFN “C-stand” (lighting/grip stand for the film industry) a variable “height” may be 0-100 and control multiple meshes or a skeleton moving up and down. The User would be able to adjust the “height” value via UI and the object would respond.
This basic functionality would enable me to make a lot of different user configurable objects, specifically Fortnite styled film equipment.
Cheers,
Matt