wow, helpful post! Yeah, I guess it was more of a fantastical thought than I would definitely do it, but if I ever need a breeding project, that will be it.That would probably take a pretty long time to do. I'd guess at least 3-4 generations to get a decent specimen. If you use White Leghorns you'll have to breed out the Dom white they carry, and then deal with whatever pattern they're hiding and get lacing back into the pattern while maintaining laying ability. If you did do it, you'd do best to cross GLW/SLW cock to a White Leghorn hen, then cross the F1 pullets back to the original cock, and again with F2 and so on. F1 would be all white/gold (or silver) leakage, but F2 you'd see 50% non white and be able to select the best laced from those. By generation three or four, with good selection, you'd have a genetically "laced" bird, but the lacing would still be messy (see: recent hatchery SLWs who I am 95% sure this exact thing has been happening to) and you'd have to pay very close attention to the pullets you select to see any real difference in egg production.