honestly i dont think this is necessary, fort has already been redone 2 times and this just doesn't look like the best remake. All it really looks like is a new skybox, only displacements really, and a few decals and props here and there. Dont just make a map for the sake of makiing a map, try to move stuff around like jim did in his fort_advanced_snowy. He did a really good job on that map.

Note: I am basing this off of the screenshots, i haven't seen the map, and these are just a few suggestions.

Looks like this tool has a couple of things hammer should have, but the reason hammer doesnt have fancy brushwork is because props make up for it. In hammer your able to do many things with indoor rooms and such.