On the original pictures of your spring hangers, I noticed a crossmember at each location. Did you have to relocate the crossmembers too?
No, the crossmember at the front spring hanger, which is now the rear spring hanger

is still there and just by coincidence the location of the front spring hanger is now at the crossmember where the driveshaft bearing is located.
seeing we're not building a drag racer, I think it should be strong enough, but I'm open to suggestions.