Add left_right_spacing with a loop.sh script that fixes all svg files after they're generated (using scale). EYE (spacing) values from 3.0 to 8.0 were tested on plotter at 50% scale. Scans of the pages were done.

left_right_spacing/.gitignore

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+*.png
+*.svg

left_right_spacing/left_right_spacing.pde

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+PImage img;
+import processing.svg.*;
+
+float EYE_INC = 0.25;
+float EYE_MAX = 8.0;
+float EYE = 3.0;
+
+
+void settings() { 
+  System.setProperty("jogl.disable.openglcore", "false");
+  size(900, (900 / 4) * 3, P3D);
+}
+
+void setup() {
+  noFill();
+  strokeWeight(2);
+  textMode(SHAPE);
+}
+
+void drawBox (int x, int y, int z) {
+  push();
+  translate(x, y, z);
+  rotateY(radians( 60 ));
+  box(45);
+  pop();
+}
+
+void draw() {
+  clear();
+  background(#ffffff);
+  camera(70.0 + (EYE / 2), 35.0, 120.0, 50.0, 50.0, 35.0 / 2, 
+       0.0, 1.0, 0.0);
+  beginRaw(SVG, "left_spacing_" + str(EYE) + ".svg");
+  stroke(255, 0, 0, 124);
+  drawBox(50, 50, 0);
+  endRaw();
+  
+  camera(70.0 - (EYE / 2), 35.0, 120.0, 50.0, 50.0, 35.0 / 2, 
+       0.0, 1.0, 0.0);
+  //background(#ffffff);
+  beginRaw(SVG, "right_spacing_" + str(EYE) + ".svg");
+  stroke(0, 0, 255, 124);
+  drawBox(50, 50, 0);
+  endRaw();
+  
+  save("left_right_spacing_" + str(EYE) + ".png");
+  if (EYE == EYE_MAX) {
+    exit();
+  }
+  EYE += EYE_INC;
+}

left_right_spacing/loop.sh

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+#!/bin/bash
+
+seq 3.0 0.25 8.0 | while IFS= read i; do
+	echo $i
+	#node ../numbers/ -n "$i" -o "left_right_spacing_$i.svg"
+done
+
+
+MATCH="left_spacing_"*".svg"
+for i in $MATCH; do
+    #echo $i
+    svg=`cat "${i}"`
+    newfile=`mktemp`
+
+	while IFS= read -r line; do
+		if [[ "${line}" == "  /><g" ]]; then
+			echo "  /><g transform=\"scale(0.5)\"" >> "${newfile}"
+		else
+			echo "${line}" >> "${newfile}"
+		fi
+	done <<< "${svg}"
+
+	cp "${newfile}" "${i}"
+	rm "${newfile}"
+done
+
+MATCH="right_spacing_"*".svg"
+for i in $MATCH; do
+    #echo $i
+    svg=`cat "${i}"`
+    newfile=`mktemp`
+
+	while IFS= read -r line; do
+		if [[ "${line}" == "  /><g" ]]; then
+			echo "  /><g transform=\"scale(0.5)\"" >> "${newfile}"
+		else
+			echo "${line}" >> "${newfile}"
+		fi
+	done <<< "${svg}"
+
+	cp "${newfile}" "${i}"
+	rm "${newfile}"
+done