So i will attempt to finish building the seat pan this weekend. In preparation for that I have 3D printed a holder for the tail light assembly. The tail lights will be a integrated LED design. See the item in question here.
The holder is designed to be repairable and I think looks quite neat. Will update you with photos of the final assembly.
If anyone is interested I can share the STL files. PM me.
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A good custom tail for a bike would be a Harley Davidson breakout fender/taillight fix. The only people doing a good job is an Australian company for $1k. There needs to be more options.