I've just tried importing terrain from L3DT to Esenthel, and it is really simple (import a heightmap image just like in MED). Covering it with tiled textures is also fine (materials should be made first from texture images if new ones are to be used), but have to be careful not to set, but blend them onto existing texture. Blending is based on L3DT texture alpha images (similarly to 3DGS terraintex.fx ffe). Blending strength can be fine tuned. Final tweakings and modifications are much easier than in MED/WED/GED/SED.