Thanks, I think i'm pretty comfortable with the .wmb format, and can read/write most parts of it, so editing an existing block / writing a new block into a level file isn't a problem.

I'm more concerned with visually representing blocks in my level. Sure I can just use level_load and blocks come, but cannot be manipulated at runtime because as you said, this is hard.

I wanted to 'fake' this by creating entities, with the exact same properties of the blocks (or most properties), and then they can be manipulated however.

The problem is getting the mesh of the block and then setting that mesh to a new entity.

If I can't support blocks in my editor, I suppose it's not the end of the world, its just nice to complete the set.