Another question on manual to pw, pd

Hey everyone, is the first time I post here and by the way cool site. Very, very good info
. Well my problem is this, I own a 93' SI and want to convert from manual to power everything and looking around I came with a part list that I needed to do so. A couple of month ago i came upon a set of doors from ex coupe that have everything except for the harness that goes from the door to the fuse box . My question is can I just trow the cables from the fuse box to the door or do I need to do something else. When it comes to electrical thing I'm a little dumb
. I've been trying to find that harness but the people that have it don't want to sell it. Wonder why... Any help would be greatly appreciated. Thanks.

