The issue I've been pondering over has been that my planned house, with a sleeping loft, would be way too tall to be practical. This is because my trailer is not the standard double-wheel kind you see on, for example, the Tumbleweed houses, but rather an old truck frame with a very sturdy wheel axle and huge tires; meaning the bottom of the house (the floor) will already be a meter (about 3.3 feet) from the ground.
After careful consideration, I've decided to simply skip having a WC in the house for more than one reason: 1) The homestead where my house will stand gives me access to an outhouse and washing (sauna) facilities anyway; 2) The freed up space means I can build a much lower sleeping loft with extra sleeping/relaxing/storage space underneath; 3) Should the day ever come when I move my house to a new location, I can always build an outhouse should I need to; 4) This way, I save on both space, material, and money.
So, here follows yet another SketchUp drawing:
see-through view from front of house.
*And now to the big news: I am, as of today, 8 weeks pregnant, which is still early days, but none the less a pretty massive change of circumstances. Although I had kind of planned for a little one to fit into the old house design, this new one just feels like it creates a great space underneath my bed for a child (once it's no longer a baby). Granted, a bathroom and toilet in the house is very nice when you have a baby, but then again, one right outside doesn't make much difference. A pot and a sink is really all you need.