The invisible wall model in the entitybank does work, however it's missing the script that makes it work, this is because it was originally part of the Easter purchase pack and when they stopped selling it they made the wall free, but forgot to change the line in the FPE file that points to the Easter pack and forgot to provide the script.
Download the attached script and put it into GameGru > entitybank > scriptbank ... then when you place the model change it's script in properties to this script. It will show as black in the editor then in test and standalone it will be hidden.
Note: This oversight is due to be fixed in the next update.
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