Tile-Based map vs. Imported 3d object map

Your map looks nice, a lot better than the simple stuff I demo'ed for sure.

There are a few ways you could go about it, but I think either way you are going to have to extend the system I built.

One option I would consider would be to force even the model to be "step" based such that even the position a unit would stand on a slanted tile would be at one of those positions which can be calculated. However, it has been my experience that when you work on a team with talented artists, they rarely like to work within such constraints.

In a scenario where you need greater "resolution" (freedom for the artist) it's always nice to find a way that you will not have to manually define this much information - especially if you want to be able to iterate on the level maps, etc. So, an option I would consider would just modify the editor script. If you defined the "range" of the board script (such as your 10x15 unit map) then it would be an easy thing for the editor to do a nested loop and perform ray-casts onto a mesh collider of your map thereby telling you the exact center positions for each of the tiles. You wouldn't treat this as a "step", but just the actual height of the tile.

You could potentially use those locations as way-points and make use of Unity's nav-mesh for animation up the slopes etc. You still might need additional "hints" of one form or another that would indicate when jumps would be necessary, but its hard to imagine all of the fine-tuning polish until you really work on it yourself.