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1) I see that traditional tubs are square but for the ones that do have angled sides what angle do the sides/back come in? And is it comfortable to sit/lean back in?
2) I also see that the tubs are custom, so does that mean shapes can also be customized?
3) What is the best way to maintain the wood? Or what things are needed to be done to keep the tub maintained (no mold/mildew/leaking)?

1) usually we slope battered ends 15 degrees (from the vertical). This is usually a detail requested by clients/local designer as they think that it would be more comfortable to sit inside. Actually, because the water makes the body float, the back assumes a comfortable angled position regardless of the tub end. From a functional point of view, straight is same as sloped. I recommend to choose the sloped option if you like the look/shape or to save a couple of gallons of hot water. The bathtub cost is same for the two options: the straight back requires less work but more material, the sloped detail involves more work but less material.

2) Yes, shapes can be customized, anyway irregular or complex shapes are not recommendable because the water pressure would cause structural problems and leakages to unbalanced shapes. We can do square, rectangular, round, ellipse with straight sides, exagonal/octagonal (depends on the size, please consult)

3) please refer to our FAQ`s. There is really no magic solution as wood is best preserved in a well balanced environment. Use the tub often (everyday is best) to maintain an optimal humidity level and avoid cracks/leaking.
For the same reasons, be sure not to use heating systems or central air conditioning in the bathroom, when the tub is not in use (empty)
To avoid insurgence of mold, open the windows after the tub has been emptied and if the weather is very humid, wipe the tub with a bathtowel after use.

Would it be okay to place a tub outdoors with its top at the level of the deck and its bottom resting on a concrete or stone slab?
We have termites in our area which is one block from the beach and thus fairly humid as well. Should we therefore use the Asnaro wood? When it’s wet, does Asnaro also have the pleasant aroma like Hinoki?

Yes, wooden tubs can be used outside but some precautions must be taken to protect it from direct sunlight and dryness.
There is no problem as long as the tub is protected with a cover from direct sunlight while it is empty. A soft spa thermal cover would improve also the situation in winter and prevent the risk of cracks caused by sudden drops in temperature.
For the termites, there should be no problem, you should build it into the deck in such a way that air can circulate around.
Asnaro has a nice and relaxing aroma as well, actually more intense than hinoki.