Would it be possible to show the co-ordinates of blocks that are missing once it gets below a certain amount, maybe 20 blocks. This would be helpful for most things this mod is used for. I would like this to be in all versions if possible, so 1.7.10, 1.8 etc. Thanks

Now thats a good idea, thats something I know I wouldnt have thought of.

How about just turn on a mode to hide all the blocks that are correct, and show highlights (that are also visible through other blocks) of the ones that are incorrect?

That's pretty much how the mod already works, except for the last part.

I can look into adding a toggle for this as an alternative for a list of locations/blocks.

If I were you I would do this and completely ignore my idea of listings coords of incorrect blocks. This makes so much more sense

The problem is, where would this information be visible?

There could be another column of information, to the right of 'amount'. It could have --- listed until there were a certain amount of blocks left unplaced, or it could permanently list a certain amount of missing block coordinates. The scroll bar would also have to be moved to the right of the new column. Both options are shown in this quick image edit.

That limits it to only a few per item, which isn't really that great. Also, on lower resolutions there is no space left on the left/right side, maybe enough for 1 set of coordinates.

Maybe a seperate menu screen then with a key bind or just a button in the schematica config menu.

I'm not really sure what would be the best solution for this. What I know for sure is that the list has to be limited to a specific number of blocks, otherwise large schematics will crash the game.

People try to load schematics that are huge, sometimes up to 400x400 blocks. One such layer would contain 160000 entries on the GUI that you're suggesting. The only way to avoid this is to cut off checking after a certain amount of blocks have been already added to the list.

What could possibly be done is not show any coordinates to begin with to not cause more lag, and then only show coordinates when there are only a set amount of blocks left unplaced, Maybe 100. I have this issue of not being able to find the last blocks of a build, and for 400x400 schematics that would be so many more blocks than I cant find.

What about if you could only see coordinates of missing blocks if you were making the schematic by layer? That might help with some lag/crashes