I can't help with the i.d. either. It reminds me of a white Baldan's Kaleidoscope (but the background on that one is really yellow/orange). It probably has some Phal. amabilis and Phal. equestris in its ancestry, but the Phal hybridizers are on something like their 25th generation of hybrids, so the species origin is pretty obscure unless you have the exact i.d.

Very pretty blooms and a nice picture - looking forward to seeing it upright!