got inspiration from the following setups.

http://forum.miata.net/vb/showthread.php?t=496353
http://forum.miata.net/vb/showthread.php?t=473720
gonna make my own carrier using
This on the seat belt tower brace
http://www.ebay.com.au/itm/Bicycle-Bike ... e01&_uhb=1
and this on my boot to place my rear tyre on
http://www.ebay.com.au/itm/Dent-Puller- ... 6d5&_uhb=1
will post pics when I get it all setup.
Keen to hear your thoughts