I love watching Goblins fly.
Especially bigger ones.
I've seen 'em in original flavor, 3", 4", and two variations on the 7.5" theme that SmokinRockets posted. One of those was a five-motor cluster of Pro38s and 54mm stuff (airstarting all the way up), and the other one (see Bill's pictures) on an M1315W. Way too cool... they seem to move out in a different way than most rockets do. I love the design!
Good luck on your cert flight, Elapid!