I don't know if this has already been mentioned here, but the skilled developer of MagicaVoxel is working on an exciting new tool based on Signed Distance Fields: SDF Edit.
He is frequently posting video previews on Twitter:
https://sumo.app/
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Preview of the new gem by EPHTracy (creator of MagicaVoxel)
SDF technology (SubDivFormer) and surely the extrem facility of use! https://twitter.com/DukeGunston
Let's go first crazy with MagicaCSG and my little prog that you can use! https://editor.p5js.org/Pilou/full/y1GHaBqyT
Just make a transparent png image with some of your modules and drag and drop them !
A transparent PNG image with anything but also some free space!
and of course can be used with any moi3D objects! (my little prog not the MagicaCSG :)