How to make a big festival kite - Tangens Delta (Part 4)

This is part 4 of the construction of the Tangens Delta and it's showing how to make the pocket and tunnel of the centre spar.
A mentioned in this video, it's really important to first make the side spar pockets and afterwards the one for the centre spar: the pocket of the centre spart goes on top of the two other pockets. You'll have to make a seam right over the pockets of the side spars about 45cm from the kite nose, as the side spars don't go all the way to the nose of the kite.