Interlocking Catan Hex Tile Holders

Inspired by similiar Catan tile holders, such as diw08's puzzle design, kingtut's derivation, and Tim Walsh's Hexels, the basic idea is to hold your existing tiles in these holders.
These holders interconnect, creating a sturdy board, while also laying flat. With this design, it is easy to set up the board and play the game, rather than dealing with warped tiles popping up everywhere and game pieces that slide all over the board.
The features of this design are:
The 'T' interconnects