weight wise, yes it supports a tv easily but does require a piece of glass top for plasma/LCD. I made the unit for my own use and I have my TV wall mounted but I am currently working on a second protype.
I can sit on the unit, the foam compresses slightly but it wont damage anything.
All the foam was cut with CNC and a table lighting knife as this is a sponge foam not polystyrene, this gives very sharp finish.
I like the use of unfinised plywood although originally I wanted to only use foam but i found it a bit much on the eye.
Also there is no added structural support the plywood keeps it riggid and the foam is firm enough to take weight
My partner wants a dog so I am savering what I have for now
Thanks for looking
Peace out Max