Zy,
The thermo gun only takes a minute or so for the plastic to become pliable. Very fast, like an industrial strength hair dryer.
It takes about 4-5 minutes for it to cool down. You need to hold the shape until it has cooled down. The plastic seems to shrink back in to shape while it is cooling down.
I like your bubble wrap idea. I think refletix, would be better. It has aluminum on both sides of the bubble wrap and should reflect heat more.
The strawberry holes are 5 inches from the top. They are 5 inches wide. They are spaced 7 inches apart all the way around.
In a 55 gallon you could get a couple of rows of the strawberry holes.
I choose the brown color so it would not stand out in the great outdoors. Of course the plants grown in it will be green. It should look like a tree trunk with a bushy top.
The water reservoir holds a little over 8 gallons.
In the spring I would use a media that was fairly well drained. Because we get rain in the spring time.
In the summer and fall I would use the most water holding capacity media I could mix. I would go heavy on the vermiculite and/or manure, and possibly use some water crystals. Because our summer and fall temps are brutal, and very little rain.
I think you could grow in a dessert with this system.
I'm thinking about chicken wire or bird netting to protect the barrel. Of course paint the chicken wire brown and green.
Take 4 stakes and drive them in the ground in a circle around the barrel, about 12 inches away from the barrel. Then wrap the stakes with chicken wire.
Animals could not even get to it. No more animals digging up our plants.
The barrel would be very easy to make into a hydro set up for indoors. You could even link several barrels together.
Just think 1 barrel and a 150 watt HPS in a closet, and 1 harvest of some nice autos, would last me a year.
I truly hope more outdoor growers and indoor growers will see the potential in this system.