Welcome, Mik. You can't go wrong buying and Escape Trailer.
The doors and drawer fronts are real wood, the panelling not. It has been ordered without doors, and the customer custom built those. No options though.
You could likely order it with no toilet and black tank, but there is a raised part in the bathroom where part of the black tank slides under the toilet.
I imagine the amount of solar would be dependant upon which model, and the available roof area. Dual batteries are common, but you could add more yourself if so inclined. Usually one either bulks up the amount of collection or storage, but not both. Dependant upon usage, most single large panels will keep the batteries topped up.