What about a tambour door (like a roll-top desk, but sideways)? Can
the back of your entertainment center be curved? Rockler and I'm sure
many other places have pre-made tambour doors and individual parts to
make your own.
Alternatively, how high is your entertainment center, and would it work
to use a door that slides back into the top? More like an overhead
garage door, with either a tambour or pocket drawers.
I know these don't directly answer your question, but maybe a totally
different idea could help (if SWMBO approves, of course). Ferinstance:
I've been planning a cedar-lined blanket chest, but also want to use it
as a coffee table, so I didn't want to have the top hinged, but wanted
more storage than drawers would offer. I was having trouble coming up
with a good design in my head, until my SWMBO suggested a door that
lifts up or drops down. Why didn't I think of that? Sometimes I guess
it just takes someone to think outside the box. Or blanket chest, as
the case may be.