getting closer to extrusion

Backfrom.scad

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+import("imprint-polyline.svg", center = true);
+import("outline-polyline.svg", center = true);

outline.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="182.24918mm"
+   height="233.85736mm"
+   viewBox="0 0 182.24918 233.85736"
+   version="1.1"
+   id="svg10582"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+<path
+     style="fill:none;stroke:#000000;stroke-width:0.76887;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+     d="m 166.54509,119.9315 c 1.31152,0.23166 2.62214,0.4632 4.03653,0.95745 1.41439,0.49424 2.93244,1.25087 4.40475,2.39093 1.47228,1.14007 2.89884,2.66313 3.90931,4.04429 1.01046,1.38116 1.60505,2.6202 2.00813,3.74661 0.40309,1.1264 0.61493,2.14013 0.73963,3.83475 0.12467,1.69463 0.16244,4.07015 0.19005,6.85282 0.0291,2.78267 0.0456,5.97235 0.0145,13.22599 -0.0305,7.25364 -0.10956,18.57075 -0.26473,25.62039 -0.15518,7.04963 -0.38658,9.8315 -0.69377,12.35358 -0.30722,2.52207 -0.69014,4.78428 -1.18116,7.00077 -0.49102,2.2165 -1.08959,4.38548 -1.78226,6.40536 -0.69267,2.01988 -1.47914,3.88978 -2.24907,5.46792 -0.76994,1.57814 -1.52328,2.86458 -2.7244,4.46897 -1.20109,1.60441 -2.84997,3.52685 -4.40582,5.0666 -1.55586,1.53979 -3.01881,2.69694 -4.78447,3.82632 -1.76564,1.12934 -3.83401,2.23088 -6.06045,3.18918 -2.22643,0.95827 -4.61095,1.77328 -7.30562,2.4771 -2.69467,0.70385 -5.69953,1.29647 -7.85547,1.668 -2.15593,0.37155 -3.46298,0.52199 -5.65076,0.66261 -2.18779,0.14065 -5.29406,0.27287 -8.88685,0.2813 -3.59279,0.009 -7.69081,-0.10723 -11.71606,-0.48091 -4.02526,-0.37368 -7.97752,-1.00572 -11.86454,-2.05896 -3.88701,-1.05321 -7.70862,-2.52778 -11.401956,-4.55539 -3.693307,-2.02761 -7.258142,-4.60843 -10.946509,-7.76064 -3.688366,-3.15222 -7.499975,-6.87581 -11.164659,-10.48562 -3.664683,-3.60982 -7.182179,-7.10568 -11.149054,-11.04829 -3.966875,-3.9426 -8.382837,-8.33166 -11.653471,-11.58962 -3.270606,-3.25796 -5.395651,-5.38461 -8.240155,-8.28568 -2.844474,-2.90107 -6.408204,-6.57639 -8.542258,-8.96331 -2.134024,-2.38691 -2.838111,-3.48542 -3.32332,-4.47045 -0.485209,-0.98502 -0.751221,-1.8565 -0.922673,-2.97929 -0.171451,-1.12279 -0.248169,-2.49672 -0.196152,-3.85328 0.05202,-1.35655 0.232768,-2.69552 0.457602,-3.71254 0.224631,-1.01703 0.499565,-1.72796 0.771476,-2.43125"
+     id="outline2" />
+  <path
+     style="fill:none;fill-opacity:1;stroke:#000000;stroke-width:0.76887;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;paint-order:stroke fill markers;stop-color:#000000"
+     id="outline1"
+     d="M 28.480721,149.99437 A 86.744019,85.602477 57.061766 0 1 16.297011,35.863199 86.744019,85.602477 57.061766 0 1 127.39736,11.400179 86.744019,85.602477 57.061766 0 1 166.19593,119.67107" />
+  </svg>