Christophe,
2.0.0 of MWE (called MWE2) contains some bundles that are not changed in major manner. This bundles still have the 1.1 version. So if I compare the build qualifier your build depends on R201106070634 2.0.0 release. You can you this archived site:
Bucky doesn't accept a .zip archive as a p2. (See error below).
Could you please to the same as you did for Xpand, which is unpack and add a link "repository".
Thanks! Christophe