G’day,
I’ve moved this thread to the general discussion to give you a chance to flesh out things before you return to the Got Skills? Looking for Talent? section.
Its also a bit difficult to read.
You start mentioning mech this, mech that before you describe the customisable robots.
Unless you have money to burn, it is best that you get some experience and understanding of UE4 before continuing.
Otherwise, I can answer one thing for you - yes, its possible to attach meshes, actors and/or components to each other (skeletons included). Whether or not they work correctly is totally dependent on the systems you develop.
If you have a single skeleton and expect to be able to mix and match skeletal parts that have extra bones or a different scale etc, I don’t see that ending well.
e.g. Trying to make a mesh with four arms work on a skeleton built for two.
If you have different skeletal sections that can bolt together, driven by a combination of fixed animations and IK, that could work.
e.g. Attaching a new torso mesh with four arms onto a set of legs.
Ask around.
Look at UE4, Unity, Blender, CryEngine etc for ideas on how to attach and combine meshes as you describe.
Then try a few things yourself in editor.
Hope that helps.
Kris