I agree with keeping the interface narrow. I bumped it up a tad, not too much. The design is at 3" of space. I didn't want to go beyond that. Just something to accommodate the dropdown and button. If we used an icon for the 'import' button next to each item, that would save a lot of space, but I couldn't think of a universal symbol for 'import'. The same goes for the dropdown boxes. You could eliminate the down arrow as it's kinda implied. Not sure you could use icons for the collision, cloth and hair though. If you could, that would save more space.