Spinning or bait caster to build rod for popper,ned rig,drop shot/wacky or hair jig 87 long 4 to 10 pound line lure weight 1/8 to 3/8 fast medium light blank what would be the way to go for reel?

Whatever you enjoy fishing the most, casting reels are more expensive to do the same job, but it's your dream, go with it.

I use a spinning setup for those techniques. Baitcasters are overkill for those techniques, IMO.. But, as already stated, it's "your dream".

Unless you have the right reel and are very good with it, baitcasting 1/8 oz lures is quite a challenge. I would go spin to make it a "no brainer" to cast the light lures. I also think an aggressive cast with a backlash on 4 pound line might break the line. I know I'm not that good to go that way.

Spinning, unless you want to torture yourself.

Daiwa Alphas Sv TW 800s from Japan. Under 200 bucks to your door ais great for lighter presentations. Can get a Roro lightweight spool and throw lures to trout as well. Just be mindful that with casting gear, the rod plays a much larger role in casting than with a spinning setup.

What blank are you using?

I am using a similar blank as described with a Shimano Curado DC and casting baits down to 1/16oz. The Digital Control helps stop the backlash and I can cast it farther than a spinning set up. If you already use bait casters it will not be a problem. It also sounds cool when you cast.

What the others say. Spinning is less problem in the wind with light baits. I use spinning for 1/16 oz weights and a finesse worm. !/8 or more I use a baitcaster.

Spinning. I am a round reel lover, but when I jig or Ned rig for walleye it’s all about that ML rod with a spinning reel.

Unless you’re doing heavy inshore fishing, I highly recommend Daiwa tatula. ESP for lighter stuff. It’s rugged, can take a beating and is just as light as a Vanford.

Went spinning ips style reel seat with cork and the cork cover on the thread cover but have not tried it out on the water dog tested in the yard thing about yard and dog no license no limit no boat and she is always in season

Spinning for sure unless you get into the BFS casting reels.

99.999% of rods for those applications are spinning. Plan accordingly...

OIf you have one rod for it, spinning, if you have two a BFS setup would be cool and fun but I don’t think that’s the right place to start.

If going BFS consider the Rainshadow IMMWS72ML-TC
Shad Raps / Lindy Rigging / Jigs / Slip Bobbers

7'2" 6-12lb. 1/8-3/8oz. 1 0.422 4.0 Fast 1.6oz. ML

More mod fast than fast, IMHO, works well as a BFS, friend of mine did one.

The older Rainshadow Inshore Popping series are pretty fun blanks for BFS. They have ultralight to MH. Getting more fond of the softer graphite as I age. If you have good casting reels, try a roro bfs spool. I put one in my Zillion and it has become my go to light inshore with 10lb braid.