I used a custom cut dacron wrapped foam mattress and cedar doors on the cabinets. I don't like to use an on board battery, instead I install battery operated led's that last a long time. The sink utilizes a hand pump. Having lived on solar for over 15 years, I fully realize what is gained and lost with DC power. It has it's place in RV's and homes, I just question if the added weight and lost space is worth it for 12 volt pump, some lights and a vent fan. If someone insisted on it, I'd do it, especially if they were wanting to use there teardrop for boon docking.