That's a great looking stock KOD but I don't think it's available for a T3. I put my T1x in a B&C M40 stock and it works great but you do have to open up the inletting for the T1x magazine to fit. It's not hard and doesn't show with the bottom metal mounted. I'm looking for a T3 Hunter stock now for mine and when I find one will most likely get a second T1x to go in it.
I think you made a wise decision Gentle Ben.