It just pops off, get a knife in under the grill and it'll slowly come off, the Allen key things are for looks. Then there's lots of screws, easy enough. The central piece is just rubber, carefully get that off. You should be able to get a knife or such between the outer rubberised body and the plastic thing the speakers are attached to, that will pop up. You can then detach all the wires as they're plug types usefully.
I'm a little stuck at getting the charge port itself out, but is will only be a matter of time before it bends to my iron will!!! Lol, good job I didn't put a Y in there lol. Anyhow, there ya are for anyone who wants to try this