RE #8: I totally agree that AE is more likely to use fix in the sense of repair and "attach" or similar instead "fix" for the general sense of putting something together in some way. That said, M-W does indicate that that use of fix is legitimate in AE.
Here's their note on the subject:
fasten, fix, attach, affix mean to make something stay firmly in place. fasten implies an action such as tying, buttoning, nailing, locking, or otherwise securing . fix usually implies a driving in, implanting, or embedding . attach suggests a connecting or uniting by a bond, link, or tie in order to keep things together . affix implies an imposing of one thing on another by gluing, impressing, or nailing