I am currently working on my first ever sort of custom lightsaber build but dont really know what I am doing so am posting here to both document my progress and get some advice

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The goal is to use this toy lightsabers lights and sound card inside a 3d printed body to make the saber staff as seen in this concept art.

Thus far i have completely dismantled the saber to have access to the electronics but am nervous about cutting any wires just yet.

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What I am planning on doing is keeping the main blade and soundboard relatively the same and placing them on one end of the staff and lengthening the wires that run to the side blades to get them to the other end with some connectors in the middle to allow us to separate the staff for travel. The biggest concern I have thus far is if I were to swap out the battery pack for one that would work easier inside the staff what kind of battery pack should I use and will I need to add additional resistors?