When I place custom platform items, the green lines of original Nadeo blocks remain visible. Is there a workaround for that? I have watched tutorials and tried to edit the original blocks but I can't even select those green lines to delete them manually. I can only manipulate the platform itself but that's basically the only thing I don't want to :D

I figured it out. I have to make an Item form a selected block and not edit the block as it is. I can delete the green parts now. Still a bit finicky to be honest but it is what it is. If someone needs I can explain it here.

Although if there's a simpler solution don't hesitate to let me know :D

Yes so when you open your "custom item" you go into mesh editor then you do a "CRTL+A" it will select ALL the parts of the bloc. Then you maintain CTRL and Click on the faces you want to keep. After that you just press "Suppr" and you will only have the parts you want ;)