Landau foam is a polyolefin foam. Plastazote is a brand name for polyolefin foam that is available in different densities.

Don't use a welt cord, I leave a 1/32-1/16 of the accent strip

http://springfieldleather.com/Needle-Perma-Lok-Reg
Permalok needle. they have a threaded tube that the lace is spun into to lock it to the needle.
I usually use a small diameter hole punch rather than the chisel, it just comes down to what you prefer and the look you want.
http://springfieldleather.com/Book-How-to-Lace this book shows a step by step of the different styles

http://springfieldleather.com/lace/Kangaroo-Lace

You'll want to use kangaroo lacing, this is the strongest most durable option.
http://springfieldleather.com/lace/Kangaroo-Lace

Custom seat in leather, alcantara and carbon fiber print