A couple of things I would like to state given the latest comments.
A unit can teleport to any place it desires. So it can teleport perfectly fine in between the SMD and the walls surrounding it. It can also teleport at some point away from them and then start reclaiming and then build the E storage. Reclaim and build is not blocked by shields.
Here are some plain and simple facts about the costs of the SCU+Teleport+SML+Missile vs the costs of the SMD+Missile.
The costs of the SCU + Teleport:
17.050 mass and 1.525.800 energy.
The cost of a strategic missile launcer + missile:
27.000 mass and 1.560.000 energy.
Total:
43.050 mass and 3.085.800 energy.
The costs of an SMD + missile:
11.100 mass and 465.000 energy.
So for the price of an SMD killing unit and the SML+missile to actually make the SMD killing unit viable, you can build almost 4 SMDs with each of them a missile in it.
That being said, I think the death damage of the E-storage is too high. I think 500 is enough (Yes I know that that can cause a chain reaction).
Additionally: I haven't seen a replay yet. From what I read in the previous discussion about this, there was just one game in which it happened. So: where is that game?