OK, I found what the problem is.
Basically, three things:
1) You never call the function
ShowFutureDesign(). Try calling it from the
func _ready() function
.show(), actually, not
3) Make sure the
get_node() method gats called on the right node. If you try to access the nodes from a subnode, you might have to use the
get_parent().get_node(Obj) method. or something equivalent.
I have updated the answer to this. If this is the right answer, please mark it as best so that others can find it too.