newbie looking for beginner advice [TANKS]

["rcdude gt" <rcmac143-at-hotmail.com>]

hello my name is Simon and I am new to this list.  I am planning on building 
a 2ft long tank.  I was doing a lot of research.  I was planning on using 
c2060 chain, double on each side and spot weld 5-6" track across the two 
chain.  I have difficulty finding drive sprocket fot this size chain. I 
found this conveyor chain on ebay 
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=004&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=140076464997&rd=1&rd=1
 
  it is a #40 chain that require #40 sprocket. it have 1 1/2" top plate.  I 
was thinking about attaching 3" top plate to the original top plate, but I 
don't know how strong the original top plate is attach to the chain.  I am 
also thinking about doubling this conveyor chain so I could attach a 5-6" 
track.  thank you.