Nick,
I cut down several dozen +30 year old red tips last year. Some of the larger trucks were 10" diameter. The wood seemed to be a little more dense than poplar. I was expecting something softer but it was like a mid level hardwood. Kind of a light grayish/tan color with no special grain or anything that would make me think it was anything special. I offered it up here and locally to some turners but had no takers. But it burns well.
FWIW, I still have 6 or 8 red tip stumps waiting for my back to get better before removing. About 18" sticking up out of the ground and 8" -12" dia. I think they would look better than any other wood in existence if turned on a spinney thing. Anyone wanting this exceptionally rare and exotic wood....Just come and dig them out and they are all yours. :wink_smil