I'm a fan of having projects to make for oneself as a hobby but for simple things that are readily available, personally I wouldn't bother.
Basic 1911 wood slab panels are available in just about every variety of thickness, texture and wood type. Easy enough to make with even hand tools but super affordable to buy (relative to the material blank cost).
Resin panels may be more of personalised touch if creating one's own laminate design vice buying blank boards.
Target-type grips would be something that many would want to invest lots of time and effort to fit to one's hand and preferences, which would be worth the venture if one really wanted a moulded grip 1911, which would be a rare case on its own.