cant really size my Jupiter 2's , invaders or other saucers hull plates correctly and im having problems joining the seams of the inner plates to the surrounding rings or hulls, walls, whatever you would call these joins, I don't know? should I use a compass to trim the lines for a matchup? maybe someone knows the best way to do this so I don't waste my time? right now, I am drawing trimming lines with a pencil and cutting away with small scissors. here are some pics so you can see where I am at, and what the next step needs to be. thanks.