If you do want to build bodies for left side mounting and only want to develop the bodies, We are willing to supply left side mount chassis and mounting hardware. Of course our car wheels and front end mods work for both left and right side mount. If several were ordered all at the same time they could be stacked in one crate making shipping a lot less expensive.
We would go with our M72D type chassis and can develop mounts as we have bikes into the shop. Right now we only have a very few bikes that we make both left and right side mounts for.
We are also looking for an importer / dealer for our sidecars. Once we have two firm orders unless we work out some other sort of deal we are planing on making our M72D type sidecars in left side mount.