We use Crystallization rack for our 2D storage. They have several off the shelf options available (read as pre made). We don't own said racks, but we can attest to the quality of their products and customer support. All top notch. Ask for Pat and she'll take good care of you: https://csistorage.com
I'm passionate about storage. I'm happy to chat live if you need more details. We actually in the midst of expanding to an additional 10K s/f and are deep in the process now. We're actually interviewing 4 companies, but I don't know how many of them have pre made units. Those companies are:
Staba Arte
Crystallization
Bruynzeel
SIT Spain
Good Luck
Matt
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Matthew Isble
Exhibit Designer & Founder of MuseumTrade.org
misble@crockerartmuseum.orgCrocker Art Museum
Sacramento CA
misble@crockerartmuseum.org------------------------------