I have done it in full and half. Full will feed a lot of people and you can do about a 4 layer if you want to go that high.
Any ideas on ho much stuff i would need to start with for a pan?
I will give you my best shot! 4 layers would be to much I believe, specially if you like a lot of meat, cheese and sauce like I do. The pasta calculation should be easy. 1/2 is 5 strips to a layer, 3 layers should be about one box as each strip is just under 1oz, the picture is 7 pieces of pasta. Full pan would go about 9 to a row or 27, so 2 box should handle that.
Now the hard part, meat, cheese and sauce. I know that when I make a 13x9 3 layer I use 3 lbs GB/sausage, about a pound of mozzarella, and 16oz ricotta and 8oz cottage cheese mixed with eggs. I use about 3 qts of sauce. About 2 cups each, mushrooms and onions.
I think if you doubled the above you would have a little left over for 1/2 pan. I think you would need to triple it for full pan...My best shot! Again, I like a huge, plump lasagna!