Got my mount today and will fit the weekend. Any advice you can offer with respect to fitting it to the Panny?
Yes. Take the protective caps off (with a small screwdriver) the rear of the Panny, this exposes the mounting holes for the bracket). Use the longer M8 bolts (4) to attach the brackets to the back of the Panny. Rest it upright and in a position where it won't slide. I rested it up against a leather couch (itself backed onto the lounge wall), and an old curtain underneath it to prevent scratching the base.
Make sure you drive those M8 bolts nicely home. You'll also find the bracket adjustable up and down depending on where you drive the bolts through. Mine are in on the 5th hole down from the top but yours may vary.
Next, mark out where you want to mount the Panny and get a centre line. Position the mount (this is what the brackets hook onto) with the centre line (run some masking tape down from this so you can still see the centre once the Panny is up), at the centre of the mount. Test the wall that you are not about to drill into something that you shouldn't

and mark up which 6 holes you want to drill. Two of mine (left and right) were on the outer holes and the centre ones were offset as there is no dead centre holes

. Make sure you use all 6 (long) M8 lag bolts (I think they were called). Make an small exploratory hole at each location using a good quality masonary drill bit (worth a few quid to get new ones

). Once down, using a 12mm masonary drill bit (see instructions), drill home, only as far as the (provided) raw plugs are long.
Using a socket set, attach the mount the wall, making sure its centred and level. I used a 2 foot spirit level to make sure.
Now the important. GET SOMEONE TO HELP YOU LIFT THE BRACKETED PANNY ONTO THE MOUNT. ITS VERY HEAVY AND AWKWARDLY SHAPED. There are hand slots at the rear of the Panny that help here get a good purchase on the thing. Lift and hook the top bracket hooks onto the mount. The bottom ones won't do anything and the (provided) safety bar fills in the slack here.
Using the masking tape centre line from previously, use the front Panasonic logo to centre the screen, by carefully sliding the Panny along the mount, with the bracket still located.
If it needs a height change, go back to the start and move the M8 bolts on the brackets (up/down) to suit. I got lucky and got it spot on first time
Slide the safety bar into position, release the tilting thumbwheels on the bracket, tilt according then hand tighten them and voila, your done
Took me and a mate 2 hours from start to finish.
Once up, you can tilt the bracket up about 15 degrees, to get decent cable access.
Hope that helps.