I'm still trying to decide if I like or dislike the overall aesthetic design. So I won't comment on looks.
However, your plate is designed in such a way that will not only be very flexible, it will actually be unstable to type on. Especially in the corners. Your load path has a toooon of space from the end corners to the first connection point of the leaf spring. The thermal has a similarly designed load path, but there are 3 connection points from the leaf springs to the main plate body. And even then, the corners on the Thermal were especially flexy as well.
This plate has only 4 points to provide stability to the pcb/plate assembly. On a TKL that's not nearly enough. I would suggest redesigning the mounting of the plate to provide more connection points for support.