Let me share my 500GB build.
It took 2 parts and a small philips to assemble. Here's a picture.
I have an electronics designer background so for 2 reasons I added some feet to it. Picture at
It runs 24x7 for months now and has the usual simple USB 2.0 cable and 500GB drive albeit on the router rather than the TV. In your case you need it on the TV.
Here's a case.
In the UK: