http://www.experimental.ch/SwissMade...er/welcome.htm for the
Colibri, although no address or other contact information is given.
The Swiss EAA probably can get info for you, or try the PFA in England,
the have "Accepted" the MB2, and should know where you can get plans.

As for the Pottier designs, contact Avions Pottier, 4 rue de Poissy,
78130 Les Mureaux, France or the RSA, or the PFA.