Considering the lack of responses, it appears I am the only person struggling with this problem, as usual. Should some other poor souls suddenly find themselves confronted with this same problem, though, I believe I have resolved my problems converting the old ASP.NET application. The conversion wizard just would not work with this project no matter what I tried.

So, I had VS 2005 create a new web project for me with the desired name. Then I manually added each of the form and class files from my old ASP.NET application to the new project. After numerous new error and warning corrections (v2 is so much pickier), I am now able to compile using the debugger.