I have seen a lot of other methods to go about this with fairly elaborate fabrications being done, just wanted to throw this out as an idea... Our main goal was to get it done without requiring any welding as neither of us know how to weld and wanted to keep the costs down. The only welding done was by our shop to get us the 18"x18" sheet as he did not have a single piece of that size.
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A lot of mistakes and learning were done on this..
Brat seat rails are 13" long with 11 7/8" distance between center of bolt holes, rails need to be 16" apart. We attempted to bolt to the original holes on the Outback seats and put the Brat rails in between but in my haste I put the 16" distance from edges of rails instead of bolt center.. seat ended up balanced wonderfully but does not line up with rail system of the vehicle so we are currently back to the drawing board. The Outback bolts interfere with the rails if mounted underneath them and some lengthening of the rails needs to be done to attach it to the seats.
Hope this helps give someone an idea on how to do this better, it makes the height of the finished product less of an issue by not having the traditional tubular steel/aluminum.
Edited by hanyou, 23 November 2013 - 12:54 AM.