Thanks for all your great comments. Was a joy building for MANTIS again, now let's start a spaceship
As he already mentioned, the first version of this symbol was made by EpsilonEta. Thought it was awesome and so I made my improved version.
Thanks, your basic version was really inspirational. First had problems to close the gap, but then I found one. The bottom slope is upside down and not connected. But it could be connected of you put it in front of a wall. The section over this is filled with vertical Studs and 1x1 plates.