Rob,
Not only am I enjoying seeing you do something I know I can't do, I derive inspiration just from looking at your work!
I recall how much you helped me when I was struggling to build my Cutty Sark. You, I believe, were on your umteenth buld of Revel's CS at the time. Believe it or not, it was your building of your CS at that time that kept me going in this delightful hobby. I'll always be grateful to you for that.
Back to your Great Republic, it's coming along nicely - to say the least. I am a little confused about the length of your model. If, as you've said, it's 1/280 scale, then it should be 14 5/16" in length (The Great Republic was 334' in length which is 4008" which divided by 280 = 14.31"). Somehow the pictures you're posting make it seem larger. But, I guess, that's just because I don't really have a reference in your images to really perceive it's dimensions. How long is your model?