but your comments are a tad premature I'm afraid. I've had to remove everything except the Ballast Tanks from the WTC. The Engel plans and instructions call for approx. 3.5kg of lead ballast. In the above photos I have at least 5kg and shortly after added even more lead and she still is not down to the water line, being the top of the red hull. Even with both ballast tanks full, she only lowers 10mm or so into the water. i.e. she doesn't submerge!!!!!!!!!!
Ergo, I removed everything from the WTC, including the lead ballast so that I could tidy things up and make more room for LOADS & LOADS OF LEAD.
So far I've managed to get it down to the level shown in the photos. It's getting very difficult to carry as it weighs quite a lot. I need to totally re-think the application of the lead ballast and the electronic equipment tray that holds the battery pack, servos & switches.