I really like the Scout Rifle concept and the M1A Scout/Squad is a good platform. You really don't have a much shorter barrel than you do with a full size M1A though. You might want to check out the Vltor or Sage stocks and put one of those on a full sized, or Scout model.
The last Sage photo is on a Scout/Squad, the 2nd is on a full sized M14. The Vltor is on a SOCOM, so if you were to put it on a Scout/Squad, the barrel would be 6 inches longer. They look really slick.