Argh! the textures hurt my eyes! I don't think the textures help show what you mean, to me they make it unclear...
No wback ON topic, i think the bottom rail is fine, all our staircases in the new building at school (amazingly contempory as it is (and actually quite cool, though i hate to admit it as it IS a school building)) is just like that, I think however it does need to be attched to teh stairs them selves in one or two places but overall it cna stay. Also at school (no im not obsessed with my school i hate school...) they have bits of wood in the metal rhombuses (hope you get what i mean, inbetween the top bar an the bottom one) which looks very contemporary and stylish (for a school...)
So i would keep the bars, but attatch them to the stairs here and there, and maybe think about something to make the the stairs more inetresting (hence the bits of wood ect). Oh and like Squinky said, tone down the colors.