Now that Andy Schleck is on a Trek Di2 team, you should give them a call! I know you guys have some good old friends and contacts from Trek sponsored roadies.
Give Andy a Di2 with only one set of buttons, and he wont cross his chain in the French mountains again, when he’s been pegging in up the mountain. (But I guess the move away from a SRAM team may have been partly a reaction to last summer’s Redd chain suck anyway.)
The boot is made from a Challenge Latex tube. I don’t remember the savings, but it was significant. I think it was in the 80-100 gram range. The latex was great for weight but lacked durability and had to be replaced frequently. In the end the best option is to use a standard lightweight butyl tube which is what most of the Cdale factory riders are doing.