Looks great!
I had a very similar baseboard arrangement in the attic many many years ago; eight 2' x 4' baseboards arranged just like that to give a 14' x 6' layout.
Looking at what you have there, you could almost triple the length of your ramp by following the curve of the upper level, then running it alongside the front of the upper level again, reducing the gradient to a third of what it is.
If the upper level is at 10cm high, then your ramp would have dropped to only maybe 3cm high by the time it had gotten around to the front, so wouldn't obscure anything, really.