Speaking from the 3D Weapon side. If you use 3D to create concept meshes that's totally fine, just make sure that in the end what you've created will work with the existing rig and animations. Same idea with 2D concepts. It really helps us 3D peeps keep the task on track when it reaches us!

Thank you, and same! Anything Eris / Hive theme and I'm sold haha.

Thanks Ivan!