Have you considered alternative means of concealment? e.g. mirror tvs are available relatively cheaply now, and e.g. Future Automation provide mechanisms for sliding panels at a lower cost than the motorised canvas systems I've come across.

All the best,
Chris @ Gear 7

You may want to consider TVCoverUps. Framed art or mirror adds to the room's decor, with the hidden TV beneath.

See how EASY it really is :

There are 2 options: Recess the television into the wall or mount the television. Whatever option you choose you can cover it with a piece of art or a panel that quietly and seamlessly uncovers it when you want to watch something on TV. Our solution takes 30 minutes (max) to assemble and ships within 2 days.