Plastic Stacked Tetratans

First I tried to make the stacked tans from dismantled cheap plastic snakes. Here is the set of Tetratan. The set is divided into five subsets:

Property of Pieces Number of Pieces
Height=3 or Height=414+1
Two tans in each layer15
Rectangular trapezium in bottom layer10
Three tans in one layer, but no rectangular trapezium12

This way it's easier to search for a special piece, when a construction is built.

Unfortunately the triangular faces of the tans aren't perfectly plane. Therefore a higher construction is determined to crash. Especially the piece with height=4 is very unstable.

If the height of the figur is smaller than 6 and the higher pieces are squeezed, stable constructions are possible.