Thank you David,
Actually I've already done the form with Morph tool, and it's not too bad looking, but I think it will be better if it's made with Shell tool or something else.
Also, there can be a future problem with this type of forms made with Morph tool - I can't make it thick and it will exist as just a face. The problem comes when I export the file to Lumion sometimes Morph faces are exported correctly but sometimes they are not.. and this is the main reason of searching another solution in creating this particular type of form with a tool different from Morph tool..( I am not sure what will happen if I make a "box" from several faces and then Union them in a single Morph, but in this case for every single shape of this type i have to make 5 more morphs to close each box... )
P.S. As for my signature I will update it as soon as I get back in the office