The only mods I've done to my Redhawks: Pachmayr Decelerators (perfect for testing {my} ammo, and they provide ME with a high and secure grip for IPSC/USPSA/'combat' shooting), and the superb Millett orange-ramp front sight blade.
That baby SHINES!
(My 7.5" 357 Redhawk wears a gold bead front, but it's just a 'toy' gun.)