There was a recent thread - recommending IKEA curtain carriers. Use the Advanced Search.
one of the tricks I've finally mastered is to check titles only and I searched for "Ikea+curtain"
This thread didn't address the bottom track, but I think you might be able to use this same Ikea track system for the bottom tie down.
In my old house I had sheers on the side lights and front door. Instead of rods there were clips with a SPRING stretched beween them to hold the bottoms in. Going around a curve would require some kind of hook - like cup hooks.