Eek, lots of mods on mine now that I'm counting (though not nearly every mod that's available). The highlights:

Various extra/alternate figures w/ weapons
~90% LEDs w/ LEDOCD
Jay's Palantir
Inside decals (@sillyoldelf)
Lit Gandalf Staff (@Hdmike44)
Brass wire habitrail mod (@ryan1234)
Balrog whip (@PersonX99)
Arcade Upkeep dimming LED backglass thingy
LED ColorDMD
Pinball Refinery POTD mod
Custom Barad-dur lit eye and extra shire grass w/ lighting (by me)
....and lots of other smaller things I didn't list

BTW, thanks to everyone who makes all of these awesome mods.

The only other thing i really want to do to it is install the transparent green pop bumper bodies I've got, but I'm still waiting to get some matching dark green skirts.

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Yes, pretty much.

First I picked out a good-looking, correctly-sized Eye of Sauron pendant thing off of Etsy and disassembled it, then attached it to the tower with orange Sugru (mixed from Red/Yellow to get a good color). The lighting behind it is mostly done by Comet matrix wiring and I tried a few different bulb options before settling on a Comet orange flex bulb behind it. That said, next time I place an order from them, I'm going to get a double-head flex bulb to try because I think it would be nice if it was just a touch brighter.

Really, it was all quite easy and the only semi-tricky parts were working with the Sugru and angling the wiring and bulb just right to minimize their visibility when the tower shakes. It's probably had at least 70 games on it since the install and haven't had any issues with it.