Dudes, it’s done! Y’hear me?! I’z DUNN! Computer says YES!
What joy is this? 
Okay, so seriously, first thing I did was delete everything. Then upgraded to 4.6 - now I don’t think it’s necessary, but good to have done anyway. I then simply opened a FPS BP Template to make sure the PlayerCharacter was correct set up, and first went through zakman186’s version. Zakman: since you put up those collision screenshots, they made all the difference.
When I knew zakman’s procedure worked, I deleted everything once again, and tried the same with Glotty’s version - and removing the triggerbox from the pickup and fixing the collision stuff - it too worked!
Now, I appreciate the templates, but if I can’t create my own stuff from ground-up, then I’m a lousy game designer in my own eyes. Thus, I started a clean project, created a player character from scratch and set everything up once again. After getting the different collisions wrong a few times and almost giving up, it finally worked. Perfection, it is.
As a great thanks to you and the community, I’ll create a video tutorial going through ALL the minute details in setting this up, making sure everything that can be misunderstood is addressed - even your grandma should be able to follow it, and come back to this thread and put it up. This way, anyone needing to know how to do this will have the entire solution easily accessible.
Again, thank you!