don't forget the bamboo terry will need sewing as it will frey. you can buy the fabric from eco earth fabrics and other retailers, although i've been wondering myself whether buying bamboo terry squares and cutting them up is cheaper since the fabric is quite expensive, but haven't looked into it yet. bamboo fleece is also good for outsides of boosters/inserts.
adding zorb in is also a very good idea. you could always try some zorb II which is already sandwiched between other fabrics but it seems near impossible to get at the minute.