I am doing the same thing. But I left space for the flexwatt to go from one shelf to the next. Instead of putting the side of the rack up directly to the shelves I have 2x4's in between the shelve and side to give a me a gap and added support.
Example: (no flexwatt yet going on tom)
Yes it's REALLY dirty been sitting in the school shop for a few days. Also back and sides aren't on in this pic but just a reference of what I am talking about.
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