Love seeing this kind of artwork, it is a pity they cant add the pics required to be able to add them into the game.
The Wearables are like 34 images for animation.
#2 Once in the GUMPS tab, in the top left, click on Misc > Show Free Slots.
I have added a heap of custom art/animations already via item/tiledata/animdata tabs .
Have not used the Gump tab before. But as my earlier post says its empty.