For what it's worth, there is this alternative.
But it is IFS...(Ford Twin I-Beam).
And here are twin beams on an open wheel car.
Twin beams are best suited to hand fabricated frames but they can be adapted to exisitng frames as well. The first photo above uses a Ford Econoline frame with the front rails massaged to accommodate the twin beams.
For more info and pics on using twin beams you can click here.