Hi there @cole3050 
!
Have you looked at VoxelShop yet?
https://discourse.stonehearth.net/t/voxelshop-voxel-editor/5289
It’s free too and also used by others in the community.
I use it to to make outfits and edit existing models 
.
I can’t help much with MagicaVoxel, as I only use it for coloring and rendering 
.
But feel free to ask others if you need help 
!