Alright I figured it out,
I got the source saw the registery key is looking for the InstallDir key. My 7.0 installation does not have this key. Changing the version to 7.1 works.
I did run a test and the logging failed as it threw an error along the lines of the log was not initialized. So perhaps this would require a fix?
I also tried using the ToolPath attribtue of the base classe to try to override the path but that didn't work. Perhaps all VS tasks should behave use the same to look up the tool to use? I like the VB6 poiting to the task and dislike I cannot do the same with the VSDevEnv.
My 2 cents, You are still doing great work keep it up!