Hi All,
Tks for the comment
Andy,
the ground build is fairly basic indeed : base and stones are styrofoam ( or similar, I don't know excatly the english word for that

)
then sealing plaster to mold the ground itself, cat liter as stones randomly spreads
and sand is baking soda
the palm trees are from U-Model
eveything painted with Vallejo Air colors, and weathered using same technics as for vehicles
more detailed pictures can be seen there
http://navy.95.free.fr/?id=1&album=Diorama_Cyrenaique_1941Ron,
you're probably right about the box, but everythng is glued now ...