Okay, back to work on this.
Saddletank - Yes, one can make the compass, or indeed any of the graphics, transparent. Below is a screenshot of the current state of the "Minimal HUD" mod with the compass "transparency setting" adjusted to 100 out of 255, where a setting of zero would be invisible, and 255 would be fully opaque, the stock setting.
I haven't yet edited out the range & target info in the upper left, but I'll do that today. As for the various bits of unit info, for now I'm going with most of it, but I agree with your observation that much of it could well be eliminated. I find I do like to see it superimposed on the battlefield, rather than having to go to the OOB screen, but others might not.
Which brings me to a question for you and Davinci, since you two have been very helpful with this project. Do you think others might be interested in this mod? I suspect that I'm in a very small minority in my desire to play without the toolbar in what I might call "extreme HITS mode"

. I'd be happy to produce "custom" variants of this kind of thing for those who might want, say, a non-transparent compass, or no unit info in the HUD, or some such, so long as there weren't hundreds of variants :blink: . Let me know what you think.
Davinci - The thing you pointed out to me, about the game "loading default lines" in gui.csv, is intriguing. Where does the game get these default lines? Can that source be edited?
At any rate, I'm now going to fix Saddletank's "radar" issue in the mod, then try your suggestion about copying those rows back into gui.csv and zeroing out specific cells rather than deleting entire rows, as I'd done so far.
This is fun!
The attachment MinimalHUD01.jpg is no longer available