Questions about a custom web service test tool (VB.NET)

scttech

I am in the early requirements phase for an application that will test web services using xml SOAP messages. This app will be similar to SoapUI, except that the test results will be logged in the Microsoft Team Foundation Server. Below are two main concerns I have because I'm not sure how complex it will be implement.

1. System must be generic so as to run any web service message. Therefore, I can't use Add Service Reference in my project because the application needs to be dynamic and accept any WSDL, End Point, xml SOAP message.
2. System must be platform agnostic (ie., java, .net, etc needs to be transparent to the user of the application)

Can anyone with experience with this please comment?