For my previous layouts I also used 1x4's. I glued and nailed the "L" legs (also 1x4s) but everything else was 1/4-20 x 2" long bolts, washers and nuts. Easy to take apart when necessary.
For my present layout, which I have no plans at all to take apart (and it is by far the largest) I used 2x4s, nailed and glued, or screwed and glued. To see the layout, use the link below.
BTW, I would not recommend just nails - regardless of the application.
Good luck!
Alex
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