Hi there, do you have a photo or link to help us understand?

Have seen many vanities butted up against walls on all 3 sides and 2 sides as well as the usual wall below a mirror. No idea of operation of drawer/etc. until one was seen in the flesh. Depends on hinges, etc., what its being installed near, etc. Basin top taps are probably easiest to install. They also generally use a stop cock to turn water on or off (for maintenance & the like) underneath the vanity with the basin top taps. More aesthetics than anything else really.

HU-624382943's comment about speaker placement is important. As far as quality listening goes (whether you like listening to music seriously or want to enjoy fantastic sound when watching movies, you want the speakers on the narrow wall (pointing towards the set of paned windows), not on a long wall. The challenge, of course, will be to get them sufficiently spaced, since you have the bookcase on the right and the cupboard (with or without doors) on the left, as well as the door to the room itself. (That door looks uncomfortably close to the cupboard doors, incidentally.) Unless you choose to suspend your directional speakers from the ceiling – which could be an option – you'll probably be limited to the width of that central section of wall, i.e. immediately to each side of the TV.

Are you in Australia, if so, which city? Are you asking about what type of cabinets to install or are you asking for recommendations of joiners/cabinet makers. If it is the latter, then type in “joiner custom cabinets” into google, and it will list specialists in your area.