Now this is a small one just for example but the shelving unit and mylar bubble wrap only costs about $40 and its insulated.
Reflectix R-3.7 Reflective Insulation 24" x 25 $20 https://www.menards.com/main/building-materials/insulation/multipurpose-insulation/reflectix-r-3-7-reflective-insulation-24-x-25/bp24025/p-1444452049106-c-5778.htm?tid=6816708754991823350&ipos=2
Cheap plastic shelving unit
https://www.lowes.com/pd/Blue-Hawk-48-in-H-x-22-in-W-x-14-25-in-D-4-Tier-Plastic-Freestanding-Shelving-Unit/1000017489
Of course this is just a very general idea but its fairly cheap and simple to assemble with nearly no tools needed. I even think ive seen some 10' or 12" rolls of that mylar bubble wrap. Drill a couple holes for your light hangers and its pretty much done. Ive already got a few of these plastic shelves in a larger size and the shelves are not solid. No need to drill any holes in them. Although the ones pictured could be turned over and double as drip pans too.
Reflectix R-3.7 Reflective Insulation 24" x 25 $20 https://www.menards.com/main/building-materials/insulation/multipurpose-insulation/reflectix-r-3-7-reflective-insulation-24-x-25/bp24025/p-1444452049106-c-5778.htm?tid=6816708754991823350&ipos=2
Cheap plastic shelving unit
https://www.lowes.com/pd/Blue-Hawk-48-in-H-x-22-in-W-x-14-25-in-D-4-Tier-Plastic-Freestanding-Shelving-Unit/1000017489
Of course this is just a very general idea but its fairly cheap and simple to assemble with nearly no tools needed. I even think ive seen some 10' or 12" rolls of that mylar bubble wrap. Drill a couple holes for your light hangers and its pretty much done. Ive already got a few of these plastic shelves in a larger size and the shelves are not solid. No need to drill any holes in them. Although the ones pictured could be turned over and double as drip pans too.