Using GridMap in 3D to make map

[iOSxcOder]

Godot Version

4.5 Stable Mac OS

Question###

I have downloaded KayKit-Dungeon-Remastered which is great , but I wonder what size of cell size should I use to match walls , and floor tiles.

Should have separate GridMap for individual component with individual mesh library ?
When creating mesh_library in scene does it better how meshes are located around scene ?

[iOSxcOder]

My question is essentially down to this

If floor is square but wall is rectangle can they coexist on same gridmap and creating solid connections?

When wall are 4 m x 1m but tiles 4x4 should I use cell size 4x4 or two separate mapgrids ?

How about making rotation and seamless connections on corners to not overlap ?

[iOSxcOder]

So solution was mix of make modified dimension in Blender and use Apply MeshInstance Transform during exporting into Mesh Library .

Also using separate MapGrid is useful as for small_wall which have length 2.5m to fill space between wall (4m) and corner (1.5m) need 0.5m cell size in gridmap node to precisely set location , rest use standard 4x1x4 (XYZ).