I don't think you can buy off-the-shelf cabinetry for a tiny house without wasting a lot of space or building around it. So I built my own.
Here is the window seat at the front of the house. Eventually some pillows on this will make it a bit more comfortable.
To get to the loft I built a ship stair - part stairs, part ladder I suppose. You can walk on it like a conventional stairs, but it runs much steeper.
You can also see some of the kitchen cabinetry in the back. Below is the range and hood. The range is a three burner RV range and oven running on propane. The hood is only 24 inches wide but more than covers the top of the small range. It provides ventilation, and some needed light for the kitchen area. The countertops are butcher block with a dark finish. After quite a bit of research I ended up going with a wood dye to color them, and a clear finish called Waterlox, which is waterproof, durable and safe for food preparation. The product has been around for a hundred years.
Here you can see the view from the bathroom door towards the front. Note the bar below the window on the left.
You can also see the flooring in this picture. I chose to go with Allure vinyl flooring planks because of the durability and lighter weight. Installation went okay, although it seemed harder than a traditional wood floor. Being thinner than wood, it uses a subtle interlock to hold the pieces together. And it was thick enough to be difficult to cut with hand tools. But I like the look, and it should hold up pretty well.
The bathroom features a tub and shower. The tub is small but fit the floor plan well. The shower walls were finished the same as the rest of the bathroom, with cedar and satin polyurethane. But sheets of clear acrylic were fastened to the wall and sealed with clear bathroom caulk.
The bathroom sink is set in the same butcher block as in the kitchen. To the right, above, is linen storage. And below, to the right, is the water tank, water heater, etc.
The cabinetry throughout the house is made of standard pine boards, with pine bead board forming the inside of the doors.