John,
Your input (and also because I have my benchwork 90% complete) has made me rethink the access hatches/areas. I moved the track where I was going to have an engine house to another space on my layout and instead of one access point, I will now have three.
I stuck with my 2x4 construction, all I have to do is build the "door" to enter the room and add my risers.
Mike
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