yes - if you simply hex-edited the p3d, to change the texture paths, the model will be corrupt, unless the new texture paths were EXACTLY the same length, in characters as the old texture paths - this is the major downfall of hex-editing.
If you want to complete this model, i suggest you use O2, as this is one of the main functions it was designed for - to write the texture paths into the p3d.
to do this:
open the model (it will open if you're using capt moores h-6 model)
select the window tab, and select texture library
hold ctrl and double click on a texture
select the faces, then face properties tab
select all the textures listed in the window that will pop up
change the name of the texture path to your texture path.
do this for all the textures and then save
compile the addon, and it will work