My EX hasn't converted and doesn't look like it will, but I managed to get one in the secondary for a premium yes, but for quite a bit less than ebay pricing. While I would have been fine with the light up ring, the construct really does take this piece to the next level. I am royally POed over all the confusion regarding scale otherwise I would have bought when it was first released. It is slightly smaller than 1:4 though. I'd say something like 1:4.125 scale. but definitely not 1:5. I'll probably be selling my custom GL and Sinestro now. They are great pieces, but I just don't have the space for both.
I would be interested in Sinestro.