Shame about silly rules.
Sorry to see such a good project get stopped by a silly rule.
A bit of cut and pasting with the fiberglass body?
Apply to the authorities for an exemption to the rule? That sort of thing has been done before in different circumstances or at least in WA with an overlength truck that I know of.
Maybe we need to petition the various Australian states to change the width rule to say 2.1M.
Hope something comes up for you.