Found this site while looking around for a body. They have quite a few 12th scales that would fit a mini.
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http://www.kamtec.co.uk/products.php...=61&prod_cat=8
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http://www.kamtec.co.uk/products.php...D=5&prod_cat=8
For this next one you could add a M03M and M03L center spacer to get the wheelbase right.
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http://www.kamtec.co.uk/products.php...=16&prod_cat=9