I have had a few of these made up. Not the best picture, but recessed holes under to mount the scanner block to this plate, and several holes so the mounting plate can be screwed down from above the base plate.
$20AUD each, or I will be including these with every scanner set sold.
I will grab one please dave - my slow build is just that, but this will make life tonnes easier mounting the scanners.
Since I'm in sydney and your in melb, just let me know what payment method you prefer and what it'll cost to post up to sydney. I assume i'll have to add $2 for GST.