Best left to a trained gunmsith
They have been made.
Unlikely
To assemble a Mod RG 31 38 Special pistol, first ensure you have all the components: the frame, cylinder, barrel, and grips. Begin by inserting the cylinder into the frame, ensuring it aligns properly with the cylinder latch. Next, attach the barrel to the frame, tightening it securely. Finally, attach the grips to the sides of the frame, ensuring they are fitted snugly. Always refer to the manufacturer's manual for specific instructions and safety precautions.
Yes
They're scary looking.
most any large gun store will have them.
Grips, magazines, sights.
see the link below
You will need the owner's manual to walk you through the disassembly of the pistol. Springs are removed as part of the process. Re-assemble the pistol with the new springs. If you are not comfortable with detail stripping and re-assembling a pistol, have your gunsmith do it for you.
Do an internet search for Colt SAA grips and be prepared for dozens if not hundreds of hits.
Check the markings on the slide, frame and grips.
frame, barrel, sights, grips