Wall mount

[f1eng]

You dont need the wall mount in order to put the amp on the wall. Two scroues 290 mm apart will do the trick

I'm not sure that hanging the D on two screws will give enough air circulation to keep it cool. Have you thought of the sonic implications of having the amp hanging on two screws? Surely it will be exposed to vibration, flapping around like a sock on the washing line.

Not really.

If the screws are screwed in just the right amount so there is no backlash and the top screws used the center of gravity will guarantee that the lower 2 feet are also in contact with the watt, so no problem waving about.

Also the air circulation under the case is blocked either by the mounting perspex spacer or by the wall, there is an air passage in neither, so the cooling will be the same for both. In fact since the heat transfer from feet to wall may well be better than to a lump of acrylic the cooling could be minutely better mounted directly to the wall.
The only benefit of the mounting frame as far as I can see is a bit more space for cable dressing.
Plus a bit more profit for the maker