After spending a few hours with Gimp, off and on, I have finished laying out the front panel. From afar, it looks kind of cobbled together and asymmetric, but I can live with that; after all, this was all afterthought, since I had originally planned and started drilling the panel two years ago with something more minimal in mind. It was only after I finished laying out the modules and drilling recently that I decided to do something a little more with the front panel design:

I have finals starting next week, and a week’s break before I start a “third semester” course. I’ll use that break to do the rest of this work, because I have a lot of studying and preparing to do for my final exams. Sigh.
On a side note, I do not like Inkscape. The interface is bad, and trying to set it up to work as a one-to-one representation of what I planned to print out failed after multiple attempts at changing various settings. In the end, Gimp did not limit my abilities to do all of this; the only things I wished I could do in Gimp (that I couldn’t do) were: (1) change the ruler guide’s inch divisions (1/10 only? wtf!), and (2) group and hide sets of layers (would have made finding and moving individual items faster).