would be interesting to note how old this bird was the saddle feathers seem a bit on the short side which to me is an indicator of a younger bird. Spurs also seem to indicate youth. The shapes change a little as they age and put more meat and fat onto the frame. All in all the shape of the bird is getting there at least in a number of them I have seen. Especially the ones from Kathy's line that Kim is producing.
Color is going to be very hard but shape is getting there.
I was looking at some pics of NH hens the other day and if you bleach out the red in a lot of them they would look a lot like Delawares. The tails and columbian pattern while faint on the NH red is clearly visible on good birds. Thats why I think some trying to "fix" the color pattern are willing to breed Del males back to NH hens with good results. It looks like this outcross might help improve tails and color pattern if your birds seem to be lacking but as Leslie and others are saying your have to be very careful of introducing other elements. Working withing the birds you have would be preferable but sometimes the genetic drift of the line leaves you with little options.
To be perfectly honest Im thinking that recreation and merging of the lines might be a better option.
Im considering getting some PBR and NH from eight acre next year and give it a go.
Why would you want to repeat what you already have? What is the logic behind it. The NHs and BRs that you are describing here are of the same strain that produced your birds? I do not get it.