Drag and drop

hey,
i am working on a site where you have to place items from a menu into a room. The issue being that the room is on an angle, I have created the room as a series of movie clips arranged in a grid that has been skewed using a transform matrix.

my first idea was to just drag and drop… that was cool but didnt have limits… (see image 1)

then i tried to use the drag boundaries, but unfortunately that isn’t working properly because of the angled plane that it is supposed to land on.

then i tried a hitTest on the plane, but i guess that because it is using a transform matrix, the hitTest doesn’t produce effective results. (see image 2)

my latest attempt was to create a little grid and apply the floor’s transform on it, then use the methods listed above… that however did not work either (see image 3)

anyone have any ideas how i can place this item on the floor of the grid in the images?