The proposed "Districts" for the proposed Metro Charter are available by clicking here. Note that Census Data from the year 2000 was used, so Lakeland and Arlington are starting out being under represented by 15,000 or so residents! The Constitution requires the 2000 Census figures be used, but it seems the Charter could provide for immediate redistricting
It also appears Lakeland representation would be significantly diluted.
If the link to the district maps does not work, this web address can be copied and pasted: