It looks like a two roller setup. The leading edge skins might have been pre-bent to the airfoil shape, then run through the roll former to create the corrugations on the panel. This would be possible with with a three roll former (smooth rollers) to shape the skins to the airfoil shape, then process through the two roll corrugation roller. The success in this process would require some development for each panel shape. The consistent shaping of metal through these two rolling and shaping processes is predictable and of course repeatable. For the experienced sheet metal pro, the proper panel size, pre-bending panels to airfoil shape and final corrugation of the sheets, could figured out pretty quickly. As in all things, manipulating a part in this way with two different processes forming the part, has to be done with some planning and setup. The corrugation rolling, will have some affect on the previous bending of the skin to its airfoil shape. In order to assure the "final" form of the skins is the airfoil shape desired, the initial rolling of the flat skin may require adjustment of the the airfoil shape so that after further shaping on the corrugation dies you achieve the desired airfoil. There should not be a significant amount adjustment of the initial airfoil shaping however the second metal forming process will most likely have changed the airfoil shape.Are you sure that's not a three-roll former he has in that picture? I can't see the third roll but it does seem the two rolls I do see are not quite aligned vertically.
This is very doable... corrugation roll former dimensions and shape are important. If you want a wing with a 2" radius leading edge, you cant do that with 6" diameter rollers. These are elementary considerations however important for those with no experience with this process.
I have always had a curiosity about the Ford Tri-Motor design and especially the design of the outer skin, of which the corrugations provide rigidity and strength in such a clever application of corrugation.