I experienced that L3DT (Version: Std 2.5 build 6 Build date: 20-Jan-07 - Std, but waiting for my recently purchased Pro key... ) doesn't set the horizontal scale of imported VTP BT height maps correctly.
I tried VTP BT height maps written by Wilbur and Landserf, both with and without projection info.
Scale value looks correct in all of them, but actual scale is wrong in L3DT.
It doesn't matter if projection info is written in VTP BT.
In this example, the value which leads to the desired scale rather is 20 than 2*10^-4.
PS:
Design map workflow is quite strange and not intuitive. Why not organise it as layers or channels like known from any gfx software? When working on the design map, it's hard to know which scheme or features are being edited currently and a legend is missing completely.
The interface really, really needs some work.