You may not want or need as much insulation as I used. It’s very cold where I live. It is not a thing of beauty and was build strictly to function as a place to start plants and extend our very short growing season. It hides in our garage.So far it has been a constant 58 degrees inside the greenhouse. I have started only cold friendly plants. It likely gets a bit chillier when the lights go off.Materials:Many times you can find some of what you need for free on freecyle.org, reyooz.com, thinggo.com or trusty craigslist.org. A thrift store is another good place to check for some of these items.Shelf with 5 shelves $50.00 8 LED grow light panels $240.00 Roll of sheet plastic $12.00 2 Power strips $10.00 2 Timers $14.00 1 Thermometer $ 2.50 Trays $3.00Total: About 331.50 (plus tax)Time of useful life. The only element I expect not to last for at least 10 years are the LED panels. Things I had on hand:old blanket cotton cord zip ties staple gun blinder clips bubble wrap duct tape some lattice panel to keep the barn cats outNotes:LEDWholesalers on ebay.com – 2 orders - 900 LED Grow light 4 Red + Blue Hydroponic Lamp Panels. They have a few negative comments but for the most part they get 5 stars.My shelf was a bargain apparently. I can’t find these very cheap online.Make sure the timers are the grounded type (three prong.)The power strips plug into the timers.The LED panels go into the power strips.Instructions:1. Assemble shelf per directions that come with shelf. 2.Test all of your panels. You may need to send them back and it’s easier to do when they are not attached. 3.Attach LED panels to undersides of each shelf. (I used cotton cord and staples because it will be easy to remove panels if they go bad.) 4.Use zip ties to attach power strips to the back braces of the shelf. 5.Set timers for the amount of “daylight” you want. People differ on this. I have mine set for 14 hours. We will see ...