My mother has a 14k solid gold band that is ~10-12 mm wide, she has never owned a diamond in her life and wears it by itself. My MIL has a 1.5c RB diamond set in the center of a gold band that is ~8-10 mm wide...I''ve never seen a really wide band stacked such as your picture shows, but I think it looks great! Do you have a face-up pic you could show as well?
My WB is two rows of invisible set princess stones and is about 5mm wide, and on top of that I wear my 1.5c RB solitaire--it''s about 2.5mm, so ~7.5mm total width on my finger. I have long fingers, though, so the rings cover about a third of my lower finger, if that makes any sense. I have often considered purchasing a 10mm+ plain platinum band to wear by itself or with my solitaire someday...I love the look of a really wide wedding band.
I also love those Hidalgo enamel and stacking rings...I think it''s a great look and can imagine wearing one "main" enamel ring with 2 "stackers"--one on top, one on bottom.
I wear 3 wedding bands and my e-ring all at onces 5 or 6 days a week. I take my e-ring off usually when I come home from work, and don''t wear it sleeping, shower, walking the dogs, etc.
Here is a pic of my eternity band, plain platinum band and e-ring- not shown is the scalloped platinum band w/ 10 1-pointers in it that I wear on the outside of my e-ring.