That sounds like a cool project. Always a bummer to see that kind of thing fade into the periphery for sure.
This may be a good opportunity to zoom out a little bit, and work on a personal system for finishing side projects, or other projects that are taking a long time.
There are lots of possible ingredients, metaphors, and so on, but what's most important is to keep changing and reorganizing your approach in order to find those ingredients that work best for you and keep you engaged with the project over time. Even or especially when distractions or huge problems come up.
A really simple tracking ingredient that works well for me, for example, is to measure something I call executive distance: How much time has elapsed since I've done anything on the project. This distance can affect motivation, working memory, technology approach & technical debt, and so on, so it's important to track it as a way of helping you determine whether your overall plan is really working. If the xd keeps going up over time, your plan needs to change.
You may also want to look into using automation and systematization (more the latter at this stage, I'd guess) as topics to research. They require a more grosso-modo approach to some details, but in exchange you are able to design and manage a system, and this is the metaphor most people want when they need a lever (so to speak) to use on a daunting project.
Good luck to you, hope you find a way back to that project.