I am not sure exactly what you mean by being eco-friendly. The fact that you are considering re-purposing something someone else is no longer wanting to use is about as eco-friendly as you can get. Anything else is just icing on the cake.
You have identified a lot of very pricey stuff to put into a conversion.
Before you get all excited and enthused about all of the neat stuff you will be installing you need to determine how you are going to be using your bus. The parameters of living 100% of the grid require a lot more investment in systems than if you are going to be plugged in somewhere some of the time.
Before you can purchase solar panels and a battery bank, let alone the charge controllers and everything else that goes with solar you need to determine what your daily energy consumption will be. Your consumption determines the rest of the equation. Whatever that number is you are going to at least double or triple that amount to come up with how much of a battery bank you will need which will then determine how large your solar array will be which will then determine the size of the charge controller. And of course, the larger the system is the larger the charge controller has to be. Large=more expensive.
Some have built all electric conversions with nothing running on propane. If you decide to go that route you may have to tow a trailer to carry your battery bank and to have enough solar collectors to keep the battery bank charged up.
Since this is going to be your first attempt I might suggest you not think in terms of your first conversion being your forever life long home. After living with your boyfriend and dog in a bus for an extended period of time you may discover you need more space or the lifestyle is just not you. I would hate for you to put $10K+ into your solar array and battery bank and decide this isn't for you and only get $500.00 out of your investment in solar power.
Unless you are independently wealthy or won the Lotto you may want to consider purchasing a wreck of a newer stick and staples moho and use it for parts. Many times the moho's came with gensets that can complement your solar array. All of the moho's come with all the modern conveniences that can be swapped over to your conversion. So instead of spending $2K for an RV gas/electric fridge you can spend $1K for a complete RV that has a working fridge, stove, microwave oven, furnace, hot water heater, and roof top A/C. It will come with black, grey, potable, and LPG tanks. It will have sinks, faucets, a toilet, and a shower. It might even have an awning that would work for you. And if you don't want the genset it can probably be sold as a stand alone unit for about what you paid for the moho.
So again, I would urge you to get a better idea as to what you are wanting to do and then ask more questions.
Good luck and happy trails to you!