That is not really true for two reasons. 1) If you place your springs on the outside of the frame, you need to have an axle that is sufficiently wide to accomodate the outboarded springs. Your sig states that you have a mini rear axle. I am not convinced that is wide enough to outboard the spring packs.
2) Quarter elliptical springs set up this way (as on many of the Proffitt Cruisers) produce a large amount of drop because the spring pivots at the front of the spring. On a traditional 1/4 the spring pack is anchored to the frame. This means that the arc that the axle moves in is totally determined by the geometry of the links. If the spring can also move in an arc, the suspension will be messed up unless the arc of the springs is the same, or very similar, to that permitted by the link geometry. You can't just slap the springs and the links together if you go that route -- you need to make sure the link geometry (arc) and the spring arc are integrated. IMO, this is a much more difficult arrangement to get right.
BTW an "full elliptical" spring is the traditional buggy spring, with one spring pack concave up and th eother pack concave down and th etwo springs joined by shackles on both ends.
