I say yes you could cross the Stukel to the GS line to try to improve the GS tails, can't hurt a thing as I've said before "if its not there you got to go get it" but they are right on the no need to cross anything into the Stukel line it seems he has that issue ironed out already.
Both of the historys on these two lines originate back to the EB Thompson "ringlet" strain so you are not going off into "never never land" with this cross
Jeff
It seems to me there are only few breeds that the crossing of strains and such where it is one of the "cardinal sins in poultry breeding" is on the "Reds" why I don't know,(I guess one could breed his line into oblivion quickly by doing so) but too this is why they are hard to breed correctly also. Not too many other folk get all up in arms on crossing lines/strains as do the "red folks" IMO LOL