Help with kit for custom light

Trying to build the light orb from the show Dark. I have printed the shell , but the original instructions use an off the shelf usb corded light and I think it could be done better. I recently stumbled upon this sub and am already the prows owner of a Thor 3 LEP. However I know nothing about drivers and different model leds and controllers and such. I don’t mind soldering and putting things together but genuinely have no idea about what all is needed to make this all work. Can you recommend what components exactly you think will work for this. I don’t want to light the neighborhood but something useful to carry on a night walk or camping or fishing would great . Ideally the battery should be inside and I can run a charging port to the opening of the handle. Expect the shell to be glued together and don’t really want to tape a battery pack like the original model . The handle is hollow through out and the top has a cut out for a round switch which I can probably print a gasket inTPU if there’s no switch that matches easily here are some pics to help visualize things