July Update:
I officially have menus working in game! So far I've got the main menu, difficulty selection, character creator, lightsaber creator, and load game menus fully functional. A few bugs to iron out here and there, but mostly minor things like text alignment. The only major bug so far is the sound which is firing way to often at the moment due to the amount of mouse events I've added - a problem I didn't realise I had until I recorded this video, as I've been working with the game muted so far haha. I'll also continue to tweak elements down the track, such as refining the colour options in the character creator.
The biggest update is that I've had to make engine modifications to accommodate my designs. These have been mostly minor so far, including new ITEM_TYPES and cvars, but may expand larger with time. I've forked Somaz's WIP build of rend2 as the basis for this, so when it releases it will have full rend2 support.
Link to unlisted Youtube video to see the progress: