Alright, using Paint.Net to triple the height of:
C:\Program Files (x86)\World of Warcraft\Interface\AddOns\nibRealUI\HuD\UnitFrames\Media\2\F1_Health_Bar and
C:\Program Files (x86)\World of Warcraft\Interface\AddOns\nibRealUI\HuD\UnitFrames\Media\2\F1_Health_Surround
didn't work as smoothly as I had hoped. The surrounding box disappeared completely, and the health bar background became three times as long (not high), bright green, and opaque over damage-done and absorbs. Doubling the size of the triangular end-bars had no effect at all.
Since these are static images painted over the ground, I can't imagine that a change in their size should require a change in the config file, other than of course nudging them into position.
Thoughts on how to tweak this images properly?
