The Jerusalem Post reports on a new technique to lengthen the shaft skin for a man with a botched circumcision. Too much skin was removed during circumcision. It sounds like the man had a severe case of turkey neck and the doctors found a way of grafting skin to make that part of the outer skin longer to reduce the turkey neck. I don't know if the surgery technique would work to make a foreskin, but it may bear further investigation.
The doctors wrote up their results and published it in the Journal of Plastic, Reconstructive & Aesthetic Surgery, Volume 63, Issue 3, Pages e325-e326 (March 2010), titled: The five-flap technique for the correction of post-circumcision peno-scrotal webbing. The journal article is a pay-to-view article and the cost is $31.50 US.