Hey Thanks everybody
I get most of my plants from two nurseries in Switzerland, which have a lot of "not very common" species (but one need to go there, and go there, and go through the greenhouses or ask them to for specific plants or let them send suggestions... other source is Kopf Orchideen during the shows
as per the Orchidarium, yes I have done it myself (however, I let a profi build the tank for me after my instructions/design)... the whole process can be seen here:
Vivarium - a set on Flickr