Hi Tim
From what i believe the flowers are between Phalaenopsis and Sarcochilus in Size but i have not seen them myself ? Also the book you talk about i don't have it are you able to copy the pictures say scan and email them to me if possible i live in Sydney Australia well Near Picton to be exact.
I have managed to find a possible article i've been told it was in a Australian Orchid Review vol36,no3,September 1971 but as yet still trying to locate someone who may have a copy don't know what the Article looks like.
The Fitzhart x amabilis i am led to believe has a Maroon centre but as i said have not seen in flower.
Thanks Les