Greetings!
I'd switch sides with the bed, if you're parking on the street, due to the curvature of the road, the drivers side will always be higher. You don't want gravity pushing you out of your bed. Good idea!
I wouldn't wall up your side door, keep it operable, you can still choose not to use it and even place stuff in front of it. Still thinking this one over.
Use your flower pot upside down on your stove for heat, that way you will have full control of your heating level rather than turning a Mr. Buddy on and off continually.
Put a very comfy chair in that big open space in the middle, I have a swivel rocker/recliner in mine. Comfortable seating is a must have. A TV tray can work for a table/desk. Nah, I want the space. The bed will be used for seating.
Most often I use dollar store spray bottle for my running water, one for cold, one for warm, and one with a squirt of dish soap. These work good for washing hair, hands, body, dishes, you name it. Good idea!
I use dish pans for sinks. If I want a double sink, I use two...
You're going to want a house battery with an isolator to run your lights, TV, laptop, 12v hair dryer, etc. Lights will be LED with AA batteries etc. I'm bald so no hair dryer required, no tv, a tablet (like an iPad) will be my sole source of entertainment and I can either charge that off the starter battery or a small solar panel off the dashboard. That said, I would likely get a deep cycle battery and charge it via alternator or a small solar panel on roof. With the heat, lights and tablet taken care I really dont need that much electricity. At the beginning at least... down the road I may get deeper into it. At first I'd rather keep things as simple as possible.
Even in Canada, if you're planning on spending any time inside during the day in the summer, you're going to need some form of air conditioning, regardless of how well insulated it is. Not where I live on the west coast. Its only hovers around 30 celcius for about a month. I'd never get an air conditioner as I will never have shore power... unless I rented a driveway.
Have you given any thought to how you're planning to shower? Sit down showers can work in low top vans. My house is my van, and I totally reject the idea of leaving home to shower. I want to be able to shower any time and any where I choose, at home... I'd shower at the gym once a week, and sponge daily with a daily head wash. Again, simple is good.
Just a few ideas or suggestions for you to ponder, hope it helps!
Cheers!
The CamperVan_Man
Thanks for the tips! Much appreciated!