I also met Greg at the EPC - it was great fun talking to him (as well as to Lyman). He is a super nice guy!
Regarding GoT - I was pretty sure, that it would look in person much better than on the renderings, especially with all the light effects, but still it could be "better"... Nevertheless pinball art is different from art for paintings/prints/poster. It has to work embedded in a pinball machine, not just hanging on the wall.
One of my all time favorites - Fathom - was done by Greg... and that happened 1981... 34 years ago! And he is still in business... what else to say