Suggestions as to how this can be done if one wants to use foam on top of the door? Best switch machines to use? I am open for suggestions here so feel free to chime in please. I soon use under the table type but I am not familiar with them and their mechanisms. The throw arm or whatever you call it, what is the max. length they can be to be used successfully? Suggestions please as this IS what IS holding me up from actually starting to build something. Also, using Atlas code 55. Thanks in advance! Dave