Right click the items.cfg and press copy, then go to main FH File (The first one that you come to when you open up FH from your C: Drive), then right click again and press 'Paste'. A pop-up will come up and say there is already a file like that, and you just need to press 'replace'. Huzzah!
Also, Ouka, do you take requests with your meshes? I would like to get this map done, but I don't see any houses that suit the map. ~