Deliverator
Graphical Hackificator
EDIT: HSG is obsolete with Ablative Shields tech, which is required for FS. So, doesn't HSG disappear automatically before FS can be built? Did you make the screenshot with WB, or have you seen this happen in game?
That screenshot is from a real game. A building becoming obsolete doesn't remove the graphic, but the more serious problem is that the as the pedia says the HSG is Obsolete with Ablative Shields except defensive bonus which means you can get 100% or more defensive bonus from buildings which is pretty high.
I'll have a go at the cannotConstruct solution.