I haven't been following this thread closely but took a good look at it today and was very impressed with the car. I have a turtle back and have been trying to figure out a way to move the fuel tank from under the deck at the back to a different position where it is less likely to be the first thing hit if we are rear ended and also allow some space inside for storage. I have never seen a tank mounted that way but I like it and I may steal the idea .
Glad the titanium knees are doing well. I have titanium joints in both hips and they are doing very well after over 10 years. It is my understanding that this type of joint will last a long time, as opposed to the earlier ones that have Teflon ends. I have a knee that may need some work but am trying to put it off. At my age, they should be good for life. As you may have experienced, you will not ever make it through a metal detector but it is no problem when you explain the reason and the security person uses a hand held detector to verify it.