If I were you, I would use a func_button for buttons with Don't Move set to 1.
Thats the beauty of func_button.
As for the pieces being invisible, if they are physboxes I need more details, if they are the "standard" building blocks and you are testing the thing in something other then the actual SF mod, make sure to copy the models into the appropriate folder.
I.E.:
If using Half-Life 2 to test, copy the objects from SourceForts to Half-Life 2/hl2
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