Thanks Larry!
Here's a photo of a Mullet River Southern Rwy caboose kit:
How close do you think it is to an ACL M3:
Price is a bit steep ($120+ shipping) for a kit, and does not come with trucks, brake details, or couplers. Then add in paint, decals (if they can be found), going to bring this cab up to or pass $200 easily.
I meant to point out ACL had both woodside and smooth plywood-sided cabs.