Found something on eBay that might be of interest to you,
http://cgi.ebay.co.uk/Buserweiterung...QQcmdZViewItem It's a 3 slot Zorro backplane for the A500, but it should be possible to box it up and use it with the A1000. Also has a slot for A2000 accelerators, and what appear to be an edge connector for A500 expansions, and some ROM sockets.
From reading a mangled babelfish translation, it appears that the cable that comes with it is a DIY job, and to be used at your own risk, the original design was for direct connection to the side expansion of an A500 board installed in a tower. It's one of these
http://www.amiga-hardware.com/showha...gi?HARDID=1385