Hey Daryl, nice to hear you're still making forward progress.
One feature worth paying attention to at Guatemala borders is that they seem to sometimes run a scam where they try to make you pay upon exit if you lack an entry stamp. Strictly speaking, you need just one entry stamp to cover four countries (El Salvador, Honduras, Nicaragua, Guatemala), but you should make sure to get one for Guatemala even if entering from Honduras or El Salvador. Get a Guatemala exit stamp too, just to be safe if you're coming back that way later in the year. And be sure to get properly stamped out of the last of the four countries (usually Nicaragua), since they'll check carefully if you ever return.
And when route-planning, bear in mind that northern Honduras is more or less hassle-free, while the PanAm route includes a great many roadblocks, some more trouble than others. This doesn't mean don't follow the PanAm; just be ready to smile, wait patiently, and refuse to pay bribes for nonexistent offenses.