You fixed that so quick thank you! Coupe things I noticed, after you equip something you can then move it from the main inventory into an extra space outside the inventory grid on the left side of the very first inventory space. It is locked in that space until it is unequipped and moved back.
And two more nit-picky notes. The custom equip slots start at 0 while in the rpg maker database equip types start at 1 so every slotIndex is actually off by 1 (i.e. Equip Type 3 is Shields in database but the custom slotIndex would be 2:#:#:#). Lastly it's really not an issue but I figured I'd note it, I noticed with an empty inventory mouse movement freezes when holding the space bar. I assume this is just the game attempting to open an item window when there is none.
I will let you know if I find anything else as I play with it more.