Shoot what you have for now. BA/UU/R.
Earn some expertise, then decide what will improve your performance and/or comfort and what will just remove money from your wallet with a soft, sucking sound.
870s are like Erector Sets. The modular design makes it easy to take them apart and reconfigure for a specific mission or just to see what happens.
Or just because. We're all gearheads and love to tinker.
As to your queries, plastic is less amenable to modification than lumber. You may need to adjust fit and wood's the thing there.
Most clay fanatics use the longest barrels possible. Casey Atkinson, top female SC shooter, wields 32" barrels on her O/U. She's maybe an inch taller than Tinker Bell.
A decent smith will install a sling stud for maybe $15.
HTH....
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