How to create a Linux distribution for Raspberry Pi ?

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http://unix.stackexchange.com – I'm currently working on a projet of my own which is creating a Linux distribution for the Raspberry Pi. The fact is : It's the first time I'm creating a Linux distribution. So it's a bit complicated to get started. At first I wanted to use the LFS book (Linux from scratch) and then I realised that it would take an eternity... Here is my idea : Why don't I fork Archlinux ARM and add my own layer for applications and such ? Here is my question then : Where should I start ? I don't even know how to create a custom distribution based on another one. Does anyone ever did this before ? Than (HowTos)