Katie and Ben's guide provides suggestions for setting up a van on a minimal budget. They walk you through the process of what to look for when buying a used van, prepping it, planning your layout, and building the basics of bed and storage with simple carpentry, and utilizing low-cost gear for essentials like kitchen stove, storage containers, basic power and lighting. They break down their conversion cost (~$3K) and give you an idea of how much they spend daily (~$27/day) in a separate article. If you're looking at some inspiration for putting together a no-nonsense, budget van, this guide walks you through one couple's success story.
DIY Campervan Conversion on a Tiny Budget, by Two Wandering Soles
A couple shares their success story for buying and converting a van for under $3K.