The twist and pop card has been floating around for awhile now and they are brilliant! I wasn't particularly keen on the all inclusive fold as I felt this weakened the card base and got in way way of my clean lines.
TOP TIP: Take a permanent pen and mark your scoreboard all the way down each groove at 1 inch intervals. This allows you to line up diagonal score lines with ease. So here's a small variation which gives me the finish I'm after.
Card blank will be 5.75" x4". You need a 11.5" x 4"piece of card, scored on the long side at 5.75", put to one side.
For the pop up card piece. You need a 10" x 3.5" piece of card, score at 2.5", 5" and 7.5". First fold is valley, then mountain, then valley.