The range of items available to be attached has been increased - almost anything is attachable.
When placing item stands while inside the Enhanced Build Mode, you can select item from your inventory to Preview and place directly without having to guess how the attached item will look.
Note that enchanted items - weapons or Armour that are attached may appear to lose enchantment when removed - to fix, place in a box, leave area, return and the item should load correctly when collected from box. In extreme cases of this infrequent bug you may need to close the game and restart to flush buffers etc.