Quick advice, when engraving your friends are Johnson's Paste wax, it makes the stylus move much smoother and lessens the wear on the patterns.
A pair of proportioning calipers will be extremely useful. Use them to figure out the proper ratios, especially for patterns other than lettering.
For lettering, a printed out table of lettering patterns sizes and ratios makes for ease of setting different size letters.

I'll add more later.
My background is in lost wax and plastic injection mold making. I did tons of 2D and 3D pantograph work for years.

I also have I think the same pantograph at home. I play with occasionally.