That looks really nice. By the way, since you bought the ETA version you could consider picking up a gen lowbeat 2846 and switching the movements. You can get NIB 2846 movements for under $100. There's a supplier in TX that sells them for around $89.
Then you'll have to do some searching through posts, but Sneed posted a tutorial on how he converted a lowbeat 2846 to a GMT by removing the appropriate gears from his 2836-2 and putting them into the 2846. Worked like a charm. Lastly, he has another mod that permanently locks the GMT hand into synch with the hour hand like the vintage GMT Master performed. Do those two things and you'll have a movement functioning pretty darned close to the way the gen did.
Then you'll have to do some searching through posts, but Sneed posted a tutorial on how he converted a lowbeat 2846 to a GMT by removing the appropriate gears from his 2836-2 and putting them into the 2846. Worked like a charm. Lastly, he has another mod that permanently locks the GMT hand into synch with the hour hand like the vintage GMT Master performed. Do those two things and you'll have a movement functioning pretty darned close to the way the gen did.