If you're interested in seeing the legalese kind of stuff that might help you prepare an agreement for work being done in conjunction with other parties, you might check out the wording used on a telecom agreement at http://www.qwest.com/wholesale/downloads/2001/010605/Type2Modelfin-5-03-01w-SPOP-Wai.doc and see if it can be modified or tailored to the electrical industry. If nothing else, look in the "Terms and Conditions" section to see what kind of parameters have been defined for cooperative effort.