Problem scaling scene correctly

This project is in Perspective. For a project I have been working on I have to make a subway style motor map which I have made so far out of embedded views of which the original view is a coordinate container. I then need to connect each motor with lines which looks something like this

I want it to scale comfortably but even when I make the lines and motors have the same height and width containers they scale differently and become disconnected

I was wondering if there is anyway to group all of the items so the somehow scale the same and maintain their layout. Sorry if my formatting is off this is my first post asking for help, thanks in advance.