It'd be easier to comment if we could see the thing...

Sort the image out and you'll likely garner some actual feedback.
[edit:] Ah, good - you added it to the gallery. Now, if you go to that image, you'll find a little text box that says "Forum" (among others) below, under "Share this image." If you copy the text in there and paste it into a post, you'll get an image that also acts as a link to the gallery page, where it can be zoomed, voted upon, and commented on. For example (if you quote my post, you'll see the code):
Now that I can see it, I've got to say, nice work on the engraving. Aesthetically, the details are great - both the cutout and the etching fits. I'd be curious to see what it looks like with a bit of paint in the recesses. I am a little worried about the resilience of certain segments, though, around that cut out icon (the triangle and any of the "fins" that divide the parallel lines). I'm assuming this is acrylic, by look, which would make those sections
very susceptible to any force not perfectly perpendicular to the plane of the ruler, due to its brittleness.