Dimpled Skins with the DRDT-2 with some tape on the nose piece to keep from scratching stuff up. The nose rib flanges are too close together to dimple them this way, so I just squeezed them with the dies in a hand squeezer.
The big wooden forms are something I saw on other builder sites. Just traced the outline of a rib on some scrap plywood, cut it out with a jig saw and padded it with a couple of layers of masking tape to keep it from scratching.
When I was trying too get the skin to conform to the nose ribs, I tried all sorts of stuff to get them to lay down, but it seems like the easiest way was to just follow the instructions and lean into the rivet gun a little. It all snugged up nicely with no problems.