This DIY Campervan Roof Layout Changes Everything Inside A Ram ProMasterThe shell is changing fast. Transforming a standard delivery van into a rugged, multi-day adventure vehicle requires some serious hustle. This week, I faced the ultimate trial of routing the complex electrical backbone before locking down the interior woodwork. One mistake behind these panels could ruin the whole power grid down the line.I focused on the layout. High stakes, tight spaces. I spent days wiring up a hidden maze of power lines through the insulated walls. After testing the lines, I crafted a custom pine tongue-and-groove ceiling featuring a smooth, curved edge profile. I mounted multiple flush LED puck lights and a heavy-duty MaxxFan ventilation unit directly into the wood paneling.The roof layout? Heavy duty. I climbed up the ladder to inspect the black powder-coated cargo rack. I bolted four massive solar panels directly to the frame, running the main power cables down the back panel toward the future battery bank station.AdvertisementAdvertisementThe result? Incredible. The interior finally feels like a functional home base rather than a hollow metal box.If you are planning your own custom van build, don't skimp on the roof planning. Getting your solar and ventilation dialed early changes how you live on the road.