^^ on that point I use ACF 50 (contains a rust killer) instead of WD-40, honestly I wish I'd found ACF 50 years ago. After it's all cleaned and oiled I use Morris's Anchor Wax which can be buffed up and keeps the water out, there must be an equivalent in the states.
That is a serious beautiful moped there, love the art deco nods. As with all your builds I'll be checking in on this one👍