Yep, and now you have about half a million lines of code* to maintain as well. Have fun with it!*

* Last count the WiX Toolset had 589,719 loc but 444,936 if you skip comments and whitespace.

* This is the point, maintaining successful (and often non-trivial) projects requires a good bit of work.

You can always just merge in the latest changes from the upstream project with a click or too. No need to maintain it on your own.