For those of you who have the Disney+ streaming service: There is an episode of Supercar Megabuild (season 2, episode 3) that is all about modifying a 914-6 for doing an ice rally stage.
The episode is pretty terrible in every way imaginable. So this post is not to get people to watch it, but more to inform you that you can save your time and skip it. They don't show any of the work involved in the build, except for a few seconds of welding in a rollcage. And they go on and on about how terrible they think the 914 is.
The end of the episode has a few short scenes of the finished product doing its thing on an ice rally stage in Sweden, which is enjoyable, but that's the only non-terrible part of the episode.