OBG, you might know this already but there is a yahoo group for the EU2000 genny's. There are instructions on how to make the stacking module for daisy chaining the generators together including where to buy all of the parts. There are also instructions on how to make extended run gas tanks so that you are running on more than a gallon.

http://autos.groups.yahoo.com/group/Honda_EU2000_Generators/