hey aa. So, when you turn on the key, you get the lights that come on directly from the key as usual - tail, running, plate, etc - but nothing else, correct? Yes, that's exactly what happens.
If you've double checked all of your workmanship on the riser, and determine that it wasn't due to that, then that sounds reasonable. If all of the components that don't work share a common ground, then they probably share a common power supply, such as the main relay or load shedding relay. Those relays have been known to fail and also have been known to come loose in the box, and simply need re-seated. Don't forget to check battery connections for tightness. Excellent process you have listed, that's what i did after double checking the riser for any ground wires and watching the lamonster installation video..
And as we've learned over the years, you can't judge a fuse just by looking at at. You need to remove it and test it or just replace it with a known good one. The fuse box arrangement of fuses and relays is all there at the bottom of the wiring diagram. Don't forget to check the bigger, square fuses, also. That's for sure, i pulled all the fuses and checked them, then reinstalled. The square units 1, 2 and 3 in the left fuse box are relays i believe after looking at the service manual. I need to review the procedure for checking those since you have to apply power to them in order to have them change state.
You have the service manual. There are diagrams for wiring harness connections and grounds in there. But i think you'll find the problem on the power supply end - fuses, relays or battery terminals. That's just more common. Good luck.