A mechanic, huh? How likely would Franky be to whip things up as stage assets if he'd been paid to?
Because Ibuki is a fan of using ridiculous effects and pyrotechnics in her performances, and if he doesn't mind creations being returned covered in (pig) guts/blood, he could absolutely be someone she bugs on that end!

(She is living with a mad inventor in Recolle, but there's nothing wrong with having multiple outlets for weird machines that spark and make loud noises, right??

Plus CR between giant big brother types and this tinyass metalhead is always fun, trust me. She likes using people as jungle gyms.)