With one side done, the flasher mod keeps progressing but I don’t recommend it and won’t be posting a DIY.
The 5mms were too big so I drilled. When you drill, plastic bits get inside. The internal housing isn’t sealed. Plastic gets everywhere and no combination of sucking and blowing with a shop vac can get it all out from the stop light area thanks to the internal texture. I really, really, really hope my tail light tint hides the mess I made.
I’ll still have to drill the other side but this time I’ll be taping my shop vac nozzle over the turn signal bulb hole.
I’m not overly impressed with the result of the one side but I’m hoping that once complete, the result will somewhat resemble my vision. It could also be that I haven’t got the flasher module yet so I had it on a test transformer.
Edit: OK.... I’ll post a DIY if the second drilling works out and it looks alright in the end.