picking up a piece of 15 inch by 17 inch by1/4 inch steel Friday will be free Sunday evening to experiment will document and post
Thezaman, I'm sorry to say it, but that's not going to work.
From the article (bold mine)
Get a ¼-inch-thick sheet of steel from a metal fabricator (Search online for a local one), have it cut to the size of your oven shelf and insert it in the rack closest to the broiler.
The only possible way for this technique to work is if the steel is cut to the dimensions of the shelf, ie, it restricts air flow between the top and the bottom of the oven so the thermostat doesn't turn the oven off when the steel plate reaches 550. In the steel plate thread, we've tested 1/2" steel plate (more thermal mass) preheated for 90 minutes at 550 and that can barely do a 3.5 minute pie. The testing is still a bit preliminary, but the question isn't whether or not steel plate can bake 1.5-2 minute Neapolitan pies, but 4 minute NY pies at 500. Cut to a smaller than shelf size dimension, Neapolitan is out of the question. With air gaps, the steel will never go much above 550 (or however hot the oven will go). Steel's conductivity allows it to bake pizzas at lower temps, but not that low. For Neapolitan with firebrick, it's 850. With 1/4" steel, you're talking at least 700.
Which, as I've expressed elsewhere, is my issue with this section of the book. It has people thinking that the superior conductivity of steel will have people baking Neapolitan pizzas at 550ish degrees (at 1/4" thickness). This is not what we're seeing. The reason why their setup produces 1.5 minute pizzas is because it's an oven trick- any material that doesn't allow air to pass will cause the bottom of the oven to pre-heat well above 550- that's what happening there.
But, just because the book is misleading, doesn't mean that a no-gap stone method isn't worth trying. Because oven tricks involve safety concerns (again, something he doesn't mention), it's not something I'd set up and walk away from/forget about, but, if one is conscientious, this could very well be a viable home Neapolitan method- perhaps even more consistent than Toby's Nearlypolitan approach.