I was thinking in armors like the full armor that it's used as display or bones like dragons and the big monsters that come occasionally
oh yeah, there is so much potential to what he can make according to the knowlegde he has of advanced technology ヾ(☆▽☆)
Spoiler alert
If I'm not mistaken he will make something similar to a robot and Arti will use it in a fight to save her family.
oh cool then (=・ω・=)
if he could make something similar to a robot type puppets so that she could manipulate to fight instead of making a puppet of actual people, since the latter is just sinister xD kinda like an articulate barbie or tank kinda person, a bigger thing too like a transformer, big enough to hug a dragon to still it in its place or something (๑•ㅂ•)و✧