In customizing my plot I noticed afterwards a few discrepancies I want to fix. I've already decor'd the place with lock downs and deed items.
If I want to fix the discrepancies, will I need to replace the deed items like forge, anvil, rugs etc. and the lock downs? Or will they remain in position after I commit the fixed changes?
If you're just moving some walls or changing floor tiles, etc you're generally okay, and everything will stay as it is. There are some exceptions. For example in one of my houses I carefully placed flowers, locked them down, raised them up, customized the house to put some low wall segments for making a flower window box, then committed that design, and lowered the flowers into position. Now if I go into customize mode, those flowers will end up in the moving crate cause the walls now interfere with the flowers (basically two things can't exist in the same spot). So if you're taking walls away or moving them to a spot where a deco item is currently sitting, then it could bump it into your moving crate. In the case of my flower example, I have to remember to raise the flowers up before I customize. This is also a great little trick for floating items like placing a banner deed on the outside of your 3rd story house.
As well many of the elven deeded container items have to be removed before it will even let you into customize mode.