There is a no Pipboy mod. It is called
Pipboy Readius. It removes the pipboy and gives you a little hand-held tablet in its place. I loved the idea of it, and tried it out. But you hold the tablet at a slight angle, and reading all the text crooked just drove me crazy after a while.
But as far as a pipboy goes, I am sure there would be plenty of them laying around the Wasteland. I don't know why we don't see more characters with them. You could RP any number of reasons for a character starting with one. From it was passed down through the family, or they stole it, or scavenged it, or took it off someones body, or even bought it from a mechant, etc...
There are some alternate start mods as well. I tried one once, but found I liked the vanilla start better. Most of my characters don't follow the main quest, or the official game story. For them I just pretend the tutorial in Vault 101 was just a strange dream. I still like doing it for the same reason I always do the tutorial in Oblivion. It gives me a chance to get to know my new characters before getting them out in the 'real' world.
I made a little mod that adds a variety of different weapons to where you start in the Vault, that way I can arm up in whatever way fits a new character's style. For example Hecate started with a rifle, because she is a riflewoman/sniper. I think Molly Hatchet started with a baseball bat but it might have been a fire axe, because she is a melee fighter. Holland Smith started with the 10mm submachine gun, because she is a full auto weapon user.
Once me characters get out in the world I just ignore the main quest and its prompts, and go about my business. My backstory for Holland Smith was that she was a US Marine who fought in the Great War. She was taken by the aliens of Mothership Zeta before it went nuclear. So I did the tutorial with her in Vault 101. Then after she got out I used the coc command to teleport to the Recon Craft crash site. From there she was automatically sucked up to Mothership Zeta, and I started the dlc with her as normal.
It was the same with Oda Hidetaka, who was a 16th century samurai woman. I did the tutoral in the vault with her too, went to the Mothership, and considered her real game to start once I got there.
It may seem kind of clunky doing it that way, but I really do like that time in the tutorial, and getting a feel for what each character is like.