did you remake the map yourself or you can actually import stuff from source in ue4
tought about doing the first thing, but trust me, it takes so fucking long, though for some part i did made it myself, the main things i did were:
-import map into blender, keep in mind it doesnt have any props and you have to add them yourself
-change all vtfs and vtms into jpgs
-search right material for right prop and brush
- add material and export props in right format
if you'd make the whole map yourself, it'd just be unneccesary and takes REALLY long
also, if someone was able to pay like 20 bucks, you could export the whole map to ue4, but since i dont want to pay, i did it this way