I was going to wait until I had version 1.0.0.0 complete to update this page, but the old v0.0.0.6 version had quite a few issues with different mods, so I changed my mind. This is the latest official version from my Facebook page, previously listed as v0.0.0.7 b5.

Here is the list of changes since v0.0.0.6:

ChangeLog v0.0.0.8 BETA:
    - Mods/maps can set UC fillType parameters in their default fillTypes.xml file
    - Default US Customary internal weight unit order reversed
        + Now pound, ton instead of ton, pound
        + Changed so info hud would show more accurate values by default
    - Bale info hud has been converted
    - Placeable menu has been converted
    - "Other" fillType group has been added
        + FillTypes belonging to this group do NOT convert by default
        + Units must be assigned at the fillType level to override this behavior
        + Used for "dummy" fillTypes (i.e. object or container types)

ChangeLog v0.0.0.7 BETA 4:
    - Code changes (again)
       * Better handling of unknown vanilla function returns
    - Vanilla shop conversions should no longer display "missing l10n entry"
    - US Customary is now the default unit system when UC is first installed

ChangeLog v0.0.0.7 BETA 2:
    - Instructions have been updated and more examples added
    - The "reset" key in units.xml and fillTypes.xml has been removed
        + Assigning new units to a unit set will automatically replace the defaults with your entries
        + Appending made it hard to set the desired toggle order and over complicated configuration
        + In other words, reset is always true
    - Should now work with Realistic Seeder
    - Shop code updated

ChangeLog v0.0.0.7 BETA:
    - Extensive internal code changes
    - Possible performance boost
    - Only two configuration locations (for possible menu addition later)
    - Volume/Weight toggle has been removed
    - Honey has been added to liquidProducts group by default
    - Various fillTypes have had their default groups adjusted
    - XML instructions included with base mod
    - Added ability to create custom unit systems
    - Display mass option has been added
    - Unit system option added to in-game menu
    - Unit system selection unlinked from miles/kilometers setting
    - Unit registration moved to catch late-registered fillTypes
    - Bunker silo screen converted
    - Silo dialog converted