Summer exercice

 From:  Frenchy Pilou (PILOU)
9901.24 In reply to 9901.23 
I suppose yes because all edges A to H are "rigid" and that limits variation but in some cases we can make it...

I am waiting answer from a guy who has found a solution but i believe there is an artefact!

EDITED: 21 Aug 2020 by PILOU