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Thanks. I played those games when they came out but unfortunately I don't remember any table top rules. Maybe I had a different version. One thing I did immediately think when playing those early Fallout computer games was that they would make a great miniatures game and 20 years later there it is.
Back in the day, the fallout games - 1,2 and tactics also had on one of the cd's in the set (maybe also just with tactics) a set of rules in them for tabletop play (unless old age and a alcohol addled brain are playing tricks on me), I think they had some character progression/campaign rules, but I can't be 100% certain. I am sure better minds than mine will be able to add more info - only mention it as if you can get hold of them they may be able to me modded / used for the new game to get what you are after.
I think I found those rules online:https://gamepedia.cursecdn.com/fallout_gamepedia/6/6d/Fow.pdf?version=954a29c042845fb5d9746bd145064d75