Dear K.Samak,
My comment. Their (AspenTech) proposal 1st week don't necessary because of IP21 already install and config for 2nd week is depend on your OPC ready or not. If you use Rslinx OPC it easy to connect with CIM-IO so require only 3-4 day include knowledge transfer. You shall contact K.Pheeranut for the get actual budget. (Note: You can tell her install CIM-IO only and set user for excess data each site).
I still don't recommend to use Prosoft for gateway. You should replace controller or put Ethernet card for connect with main network.
BKD budget doesn't include TOKEN cost. I understand the TOKEN cost Scott will provide for all site.