We want to build a prototype of a flue gas after treatment stage for a coal fired power plant and we need to contract an engineering house to do it for us. Some of the big houses I contacted say they "don't do work for vendors," and they will not tell me who they hire to do it for them. I need a recommendation, a list of firms and names to call to get my prototype designed and built. Of course, the firm we are looking for has to have experience doing this kind of work. Can anyone suggest a name or two? Thank you!