Here are 8 dodecadudes. (Drawn from the very numerous dodecadrafters, made from 12 half equilateral triangles, dodecadudes are a subset of 770 pieces with sharp points and narrow necks excluded). Arrange them into a symmetric dodecagon with sides (1 triangle edge)(2 triangle altitudes) alternating. You may rotate and flip the pieces, no overlaps or gaps. This is at a "somewhat tricky by hand" level, computer help will just spoil it for you.

Here is an example of the target shape made with a different set of dodecadudes.