I rewired my 404 restoration. It was not that hard, a little time consuming, that is all. If you look at page 11 of 69 404 Restoration it will give you an idea of what is involved. https://www.aussiefrogs.com/forum/index.php?threads/69-404-restoration.98543/page-11
Being in Brisbane, I'm quite happy to talk you through it. Can help with contacts to buy required wire etc., also I can give you copies of larger scale schematic diagrams, which are easier to follow.