Home Improvement Questions? Ask a Handyman for Answers
So you want to build a wall that's 32" long alongside the 48" dimension of the base? If so why not make it 49" long (it has to extend beyond the base)?
I'm just trying to understand your situation. Given what you want to do the only option would be to step it down. If you're going to tile then the step down would have to be the height of the curb + the width of at least 1 course of tile at a minimum.
I don't get the exclamation points? You can use solid surface panels like Swanstone with your config (or tile). You can't use fiberglass walls.
Do you have any more questions?