I have a projector once it dies, I will likely change to a big flat screen smart TV.Other wiring planning:Wire it for a projector too and put a plate over the connection box in case you change your mind one way or the other.I would add wiring to where your internet router will be located so that it is easy to hook up.Plenty of outlets.Extra room in your Circuit Breaker box for expansion.Plenty of 3-way switches for lighting.Prewire for an EV.Flood light wiring outside that can be used for mounting ring cameras.

Like is a hot and cold line got reversed or a bad circuit etc. if your getting a loan on the property then the appraiser needs to do a 442 for the lender and everything needs to be ship shape.

Instead of one big unit (which sucks a lot of amps and can pop breakers) we deploy a number of small units throughout the house, kitchen, bathroom, and at least one in the basement.ROI on the equipment is probably in the 1000's of percent 

Do i need to upgrade the breaker box from 100 to 200 amps? 

Smoke alarms should be hardwired, interlocking and on a dedicated circuit.

Probably too many outlets on a circuit and a lack of proper grounding on everything. 

Yesterday was the very first time that we have recommended purchase of a new tub for an owner:  It had a crack in the tub that could not be repaired.A hot tub is a pretty simple, unsophisticated appliance:  You have a shell, a heater, a pump, and one or two circuit boards. 

The utility overhead lines are at the rear of the property and feed two separate meters (in a combined housing) that is situated on the ADU.Line 1 runs under the ADU to feed a sub-panel servicing all the circuits for the ADU located in the mater bedroomLine 2 runs under the ADU and then underground through the backyards to sub-feed what used to be the main panel for the existing house.

Not a deal breaker necessarily, but a risk to be aware of and mitigate.2.

Not a deal breaker necessarily, but a risk to be aware of and mitigate.2.