Forgot to mention in my review of the Nk'Mip Desert Centre that handicapped parking spots are available in the lot in front of the centre... BUT the ramp from the parking area to the front door is both long and pretty roughly gravelled. It was a slog for my spouse hauling up the incline, and he's pretty fit.
We didn't discover an alternative until we reached the terraces beside the entrance: there's a partially paved access for vehicles up to a level parking area, entered from the right-hand side of the Centre. If nothing else, we would have preferred this shorter shlep to the intended path just because the gravel had been compressed by vehicles...
The parking area is signposted 'loading and unloading' of disabled passengers only, but I daresay if you're travelling alone, you could put your blue badge up and no one would insist you move it.
The Centre is accessible throughout, as are the sculpture gardens reached from inside the museum. We went a few hundred yards out on the trail, too, but a helping hand was needed here and there. A great visit.