Where can I download different UIs outside of whats currently posted here
 

Kind of want to DL some target rings, maybe a rework of the con window and grouping window, etc.

Where can I find some mods for this?

target ring and con window are both removed from p99, most things on eqinterface.com can be modded to work here

eqinterface.org

interface pieces section

try the very back pages of the section for compatibility reasons