Refs for proper burning at Burning Man would include the Guidelines section for art installations, linked from
Per last year's guidelines...
...major art installations intended for burning typically are reviewed by the art dept WRT safety concerns, timing, emergency plans and equipment for fire suppression, crowd control, proper measures to avoid burn scars on the playa surface, responsible use of fuel, pyrotechnics and flammables, and suchlike. The only context in which MSDSs (Material Safety Data Sheets) are relevant is for hazardous materials.
The burning of any toxic materials is prohibited by law, that means stuffed furniture, rugs, or anything that contains synthetic and plastic materials which will release toxic fumes into the air.
I wrote most of the section on burn scars linked from the first ref, for the art dept.
I had some input on the second, which was prepared by Earth Guardian types. Regretfully, on a close reading, I'd say it needs a bit of editing for clarity on such terms as "toxic".
The conventional approach -- whether for a large installation burned in place, or pieces of your camp hauled out and burned on the public burn platforms, burning of any common wood product, paper, cardboard, papier mache, cotton canvas and other natural fabrics, including wire, nails, screws, etc., painted or otherwise, is all okay. If synthetic fabrics, plastic pipe, and suchlike were part of the construction, remove them first and haul them off with your garbage. For art installations, the understanding is that everything must be cleaned up by the artists; use of the public burn platforms is less clear, and a matter of personal responsibility. A few shreds of plastic burned is no big deal, IMO, but it's just common sense to avoid burning whole couches, vinyl tarps, carpets, etc. If you toss a construction with a lot of metal attached on the public burn platforms, the responsible thing would be to fish out as much as you can it after it burns and haul it home. The ashes in the burn platforms are dealt with by Burning Man's DPW.
Some people have objections to burning any quantity of paint, glue, zinc-coated steel, etc. Some people have objections to burning anything, just as some people might tend to burn just about anything at an event other than Burning Man. In my experience, the objections are weighted much more heavily to opinion and folklore than to reliable science, and relying on what is conventional at Burning Man is probably more useful. To avoid all the hair-splitting about environmental or health effects, you'd probably want to avoid buying a ticket at all.
Re: recycled wood -- In a hair-splitting sense, I see no implicit bill of environmental health and goodness compared to new wood, as you never know what kind of materials might have been in contact with it in the past.
Re: form stakes and such -- I prefer 3/4 in. dia. steel stakes, which drive in and knock out fairly easily on the playa. Keep in mind the top 6+ in. of the playa is unstable due to desiccation cracks, wrt guying off anything bigger than a pop tent. Not sure if the OP is talking about corrugated stakes or what, but they'd probably work. Because of the way the wind whips around a floppy covering like a parachute, I might be tempted to use two stakes at each guy point driven crosswise to each other to avoid pullout, with guy ropes wrapped around them, and maybe run some rope around the perimeter if I wanted to clip the material off in between the parachute ribs with spring clamps.