A homemade one using thicker (~5mm) 6061 or 7075 T6 aluminium would be fine- if you have access to a hack saw, a drill press/ pillar drill & some small metal files, thats all you really need.
One of the guys from the LHS are using the teko mount thats suppose to be for truggy conversions, all he did was elongate one set of the stock holes in the chassis. For the other side of the mount he just drilled some new holes.