Does anyone know if you can get the hud for qw that they used
in QuakeCon on their streams?I've searched but can't find it
so I've tried to replicate it.

My hud:

Quakecon2016:


But I need some help with the frag messages to get it to look the same.

If the tracker messages are completely missing, it might be fragfile.dat isn't in /qw/ directory.

The standard one is here.

The tracker messages are showing, but I cant make it
show like in the picture, with weapons abbreviated to simple
text like "RL" or "GL" and with colour.

Is there something I have to do to the fragdata file or
can I modify it in-game?

Try cl_useimagesinfraglog 0.

Looks very similar. How can I download your config?