I will increase them to 320(w):180(h) this is a 16:9 ratio which is fairly standard.
1000 doesn't make sense, even at 4k that would be 2 bars taking the entire vertical resolution, with the new 180 at HD this is 5 bars taking almost the whole vertical resolution.
If you really want to go beyond these settings, you can always use the Frame Scale slider on the Skins>Frames>General tab, I have increased it's max to 4x and this effectively gives you 1280(w):720(h) per bar (at HD, it would take less than 2 of these to entirely cover your screen)
EDIT: Max size of 1 bar at 3440x1400 UI scale 100%: