The Tiny School Bus House - I like the way separating the driving area from the home and creating storage space above the driving seats!
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"Their tiny house features 100 watts of solar and a four-battery bank, which makes them self sufficient."
In thisArticle You will find many example and ideas from other camper van and motor homes. Hopefully these will give you some good ideas also.
Beginner's Guide to Converting a School Bus - Discovering US Bus