That’s a sweet unit! Nice buy!
I just checked Amazon and a suitable pop rivet gun with an assortment of rivets is right at $20.
But I think you made the right decision! That’s a very nice setup!
Can you say where you live, what state? I ‘might’ be able to help with the sorting, once I get this sorted out here! I only have a few things to get up and running and this system will pretty much run itself (the Hydro stuff, not the Soilless stuff 
).
Edit Add: IF you question my sorting abilities of what to keep and what not to keep, look at my last post, then Light Cage post. I ‘might’ be infected with Keepitis! 
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WHAB