Definately install a light or place a light near so you can shine it in.Being able to see in is great for the hobbiest simply because without experience it will tough for you to tell how long the part is taking to come up to melting temp.
The more insulation you install will make the oven more efficient go for 4 inches if you can, also don't compress the insulation the fiberglass loses R-Value the more you compress it. If you make a 4inch space for insulation then purchase 4 inch insulation.
Non-Stick you advice is very usefull but definately production based.
But it's easy to forget that many people here are hobbiests.
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