I have recently started drawing up the offsets for building of the Guillemot and noticed the same problems with station 9 & 10 that Marcelo (Argentina) had. I re-plotted the data points for the problem area as follows: Station 9 Buttocks Deck 9" - 4.80", 8" - 5.75". Station 10 Buttocks Deck 9" - 4.80", 8" - 4.84". Water Lines Station 9, 6" - 7.68", 5" - 8.81". Cock Recess, Offset Station 9 - 8.59" Station 10 - 8.76". Can someone check my points to make sure I'm correct. I plotted my data points using Corel Draw and had great success with scale drawings from the printer on all the other offsets.