You would ALMOST have a shadow .... the frame on the Shadow is slightly different than the SP01 with higher cuts under the trigger guard and beaver tail. The only part of the SP01 frame, however, that I would like is the higher cut under the trigger guard to move my grip up a tad, but I have NO complaints with the SP01 - its a nice pistol!
Is your 75B SAO? I would imagine that the main benefit from removing the FPB and lever would be in a SAO only pistol to remove the small amount of take-up prior to the break. I could be wrong here though - not sure if the reset in SA without the FPB results in no take-up before the break ... care to enlighten me?

My 97B is SAO and I left the FPB/lever in and there is just a little bit of take-up before the break - something I can live with.