i bought this bike used a couple weeks ago (50$) and completely dismantled it for a total repaint and rebuild (i also need a crank/chainring it seems cause mine is warped a bit, could it be fixed ?)

i want to know if anyone knows anything about it, are they built by Yamaguchi cycles ? it looks like its a late 70ies/early eighties lugged 1010 steel alloy frame with all aluminium component and araya aluminium wheels
suntour drivetrain btw theres is a made in japan stamped on every part or the bike.