The symmetry tool debuted in v0.32 update is a great help to vanilla building. I can insert blocks into another using supports. It was a painstaking process before.
This recording is how I fix the brace overlapping glitter on my SFP-V30 with the symmetry tool.
The video editing is crap because I'm a noob.
Here's another trick. It's like doing surgery outside the body. XD