after import of the 5 files, replace the original interface skins (in game interface)
exact paths are:

ui\console\humanUiTile01.blp 
ui\console\humanUiTile02.blp
ui\console\humanUiTile03.blp
ui\console\humanUiTile04.blp
UI\Widgets\Console\Human\HumanUITile-InventoryCover.blp
UI\Widgets\Console\Human\human-inventory-slotfiller.blp

(all nearly the top) 

