1. Suppose I install with following config:
sda1 - /boot
sda2 - encrypted lvm [root and swap]
sda3 - luks /home ( I will chain the luks key in root, so that I wouldn't have to enter its seperate password, method is here: http://goo.gl/yxaRx8 )

2. Now this is surely a two layer I guess:
sda1 - /boot
sda2 - encrypted lvm [root and swap] ( /home is in root itself )
sda3 - simple ext4 trucrypt data partition which I would have to manually load at every start up.

Idea is, to read/write the data partition robustly even with Windows, so I don't want to include /home in lvm.