Has anybody done this? Its an articulating full motion mount I am buying from Costco.ca. Anybody interested in this mount please be aware that costco.ca has the newer mount which accommodates horizontal vesa mounting over 600 mm (my TV needs 684 mm) while the older design of this same model only goes up to 600 mm. The Kanto FMX3 is available from different places, but it's not always clear which is which. I can tell the newer design from the older, but if you are Canadian, to be safe, just get it from Costco.ca. I can't see it cheaper anywhere else, or see it anywhere, for that matter. At least not right now.
I am planning to use a combination of altering the drywall to plywood and using flip-toggles and tapcons. A nearly 100 LBS TV hanging up to 28" from a wall on an articulating full motion mount creates a lot of force on the mounting to the wall. I had a Kanto FMX3 a while ago, but had to return it to buy a newer updated FMX3 mount that will fit my newer larger TV. The wall is a block wall, I suspect concrete blocks and not cinder blocks.
I ordered the newer mount today. Hopefully I will receive it in the next week or so and the adventure will begin. The main reason I am going this route is because I want my TV to extend a good deal into the room when I watch it, so the 65" plasma looks as big as it reasonably can from the seating positions, may as well get as much of the big screen effect as possible (I'm used to a bigger projector screen) and also so I can have a tall vertical centre speaker not restricted buy a TV stand, and lastly, so when I listen to music, I can, if I feel like it, push the TV out of the way and back up against the wall.
I'll take pictures of the process and hopefully help others who decide to go this route