A:AnswerYou are correct that you cannot download additional apps to this TV, which is actually unusual for smart TVs. A sales person in the store told us Vizio is the only one they sell that restricts that. You can use Chromecast.
A:AnswerThe box the TV come in shows 28.77" WIDE
18.83" HIGH with stand-legs, - 16.96" without stand (e.g. you're wall-mounting)
7.87" DEPTH with stand legs -- 2.99" without stand
A:AnswerSmartCast is different from Chromecast.
You can only use the applications that are installed onto the TV and you cannot download anymore or uninstall the ones that are on your TV.
If you want to use any other application such as Spotify you will have to launch them on your phone and cast them over to the TV which is a huge hassle.