happy hackenstein tk controller help

[tassadarforaiur]

Hey guys, trying to make my first custom board, and too cheap to put a teensy in. The supplies I have available are small leonardo pro micro's, SN74HC595N 74HC595 8-Bit Shift Register,  MCP23018T-E/SS IC I/O EXPANDER I2C 16B 24SSOP, and SOT23-5 LTC1799 LTC1799CS5. The board is going to be the bastard child of a quickfire tk and hhkb. And the nicest, if somewhat inefficient, way of wiring it would be a 6x17 matrix. Which of those three chips would probably be best for what I'm trying to do, and would there be a best way of wiring it in? i.e. having leonardo handle all the columns and an i2c chip handles all the row scanning, or i2c chip does the numpad cluster and f-row while leonardo handles the 60%ish area?

layout here

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part links
http://www.ebay.com/itm/Leonardo-Pro-Micro-ATmega32U4-Arduino-IDE-1-0-3-Bootloader-replace-Pro-Mini-/262136732820?hash=item3d08911c94:g:blEAAOSwMmBVzGeG
http://www.ebay.com/itm/262136735949?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.aliexpress.com/item/FREE-SHIPPING-SOT23-5-LTC1799-LTC1799CS5-5PCS-in-Stock/32249767253.html
http://www.aliexpress.com/item/Free-Shipping-Integrated-Circuit-MCP23018T-E-SS-IC-I-O-EXPANDER-I2C-16B-24SSOP-MCP23018T-E/32384475472.html

Thanks for the help!