Have you read through the modding forum?
There're a lot of excellent guides.
You could of course create a new build_prod file, which is quite difficult.
The easier solution for your problem would be to change the graphics.
I take it that you want the Medieval building icons,
which appear in the review panel, to show up in Viking campaign?
Well they're stored under campmap\review_panel\Buildings.
They're .bif-files. Look under the Tools section of the modding forum if
you don't know what a bif file is and how to open it. You will need the program readbif.
When you swap the image of VikingInn.bif for Inn.bif, the Medieval Inn should show on the Viking Map. Since all the icons have the same dimensions it may also work to just change their names. Make backups of the files, first.
However, I' recommend to download the CA-Tools from the files-section and browse through all the bif-files with readbif to learn where the files are stored and which is what.
R'as
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