Jensen, I think using reaction wood like vine maple for structural applications would be problematic. The wood would be prone to warping and blowing out joints. But it works well for bows if you can tame it. I have made some vine maple bows from the compression side and they are much easier to tiller, but they don't seem as lively - in all cases I ended up heat treating the belly to give them a little more oomph - but don't try that with high tension vine maple! Yes, the sharpie does seep into the wood a bit, but scraps off easily. I don't normally use a sharpie for marking but did so to make it easier to see in the photos.
Dbar, I normally use a tiller tree and long string, but that is just not practical when dealing with this much reflex.
No worries Dave, I'll post another installment this week.
Thank you all for the nice comments!