Tetrahexagons

Please note that plastic colors vary.

This puzzle consists of a frame and 7 tetrahexagon elements.  A tetrahexagon is a geometric figure consisting of four hexagons connected by sides. 
In the starting position, the elements packed into the frame form a symmetrical shape.  There are 4 objectives to the puzzle, and for each task, the pieces can be rotated and flipped over, but they cannot overlap.  There are several solutions to each objective.

1) Pack the pieces inside the frame in such a way that other symmetrical shapes are formed.  Try to make a symmetrical shape that contains 1, 2, 3, .... 7 enpty spaces (holes). 
2) Using all the pieces of the set, make the 8 shapes that are pictured in the instructions
3) Using all the pieces of the set, make a symmetrical tower of a maximal height. 
4) Using all the pieces of the set, make a symmetrical shape with the largest empty area in it.  (Naturally, the shape of the empty area must be symmetrical too)

Created by Russian designer Vladimir Krasnoukhov.