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Fun with layers, colors, SVG, and extrusion

I'm a newbie at TinkerCad. I am beginning a project that requires SVG and extrusion. I have never converted GIF to SVG before, and I have never tried extruding in TinkerCad using SVG before.

I have a PSD (Photoshop Document) file that is four layers--

1) White background layer

2) Gray-128 stuff on a transparent background;

3) Thin black lines on a transparent background; and

4) Thick black lines on a transparent background.

NOTE: Every thick black line on Layer 4 hides correspondingly-placed thin black lines on Layer 3.

I want to convert this PSD file to one or more GIF files, convert each GIF file to an SVG file, then extrude each SVG file such that--

a) What was white, becomes 0.0 mm tall;

b) What was gray, becomes 6.0 mm tall; and

c) What was black, whether thin- or thick-lined, becomes 7.0 mm tall.

My first issue is, How many GIF files do I make? I have three choices--

a) Flatten all four layers into one, and save as one three-color GIF file of white, gray, and black.

b) By twice deleting layers, flattening, Saving As in GIF format, then reloading the PSD file, I get two GIF files: a gray-against-white GIF and a black-against-white GIF.

c) By three times deleting layers, flattening, Saving As in GIF format, then reloading the PSD file, I get three GIF files: a gray-against-white GIF, a thin-black-lines-against-white GIF, and a thick-black-lines-against-white GIF.

So my question is: How many GIF files do I make, how do I make the SVG files, and how do I do the extrusion(s)?

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