Hi @Parker_19. Sorry, I seem to have skipped replying to you on this point:
Yes, you can place a node that doesn’t have a line connecting it, you can just make the line “Invisible” by choosing that type of line in the drawing board.
However, if you wish to place a node on the pattern, perhaps you wish to attach the label to it, then you can use the Pin tool. I describe using the pin tool in this topic: Cambio orientación etiquetas - #2 by Grace
Another option to print your size square into the pattern is to use the Internal Path tool and place it only on the back of the pattern so that you can resize .svg in Inkscape or some other drawing program.
I hope this helps you 