Nice one!
With everything it's got behind,
it almost converges to be like a 3D version of the good old "Analog Default 1.8"
https://stash.reaper.fm/theme/963/De...0Analog%20v1.8
You could even borrow the Yellow coloring of the "FX" button,
and the Red from the Mute/Rec, or Dark Red from the Markers..
It would better match the yellow main toolbar and Loop buttons.
-The 3D effect of Tracks is nicely done.
But I think the track's Gold/Gray color fade could be a little bit more subtle,
it stands out a bit, so it could draw the attention from the actual stems/items.
-I like the Transport bar, clear and tidy.
However I'm not sure about the Loop button and other loop/rate controls being on the left,
perhaps it cramps the area a little bit visually.
-I like the brighter coloring of the items, and background track space (where stems/items are placed),
but I prefeer the Round edge shaping of items/stems rather than the blocky one.
But hey, what do I know right!
In any case it's a great theme
way to go!