Any bass lure will work for coastal bass.
Here in Southern California, we have calico bass, sand bass, and several other smaller inshore, kelp loving bass that are accessible from a small boat.
Typically, you have to upgrade the hooks and split rings, both for strength, and to make them more salt water corrosion resistant.
I've out caught my buddies, who were using live bait, throwing jig heads with plastic thumper tails. I used my heavier freshwater bass rod and reel, with 17lb mono, and had no problems.
There is also a successful Salt Water Bass club that holds tourneys here, and they are mostly fresh wate bass guys who also fish the salt, and use their freshwater stuff for the saltwater bass.
Spinnerbaits are great in the kelp. So are the plastic swimbait with a lead head embedded.
All manner of wooden and hard plastic swimbaits work, too, but it's kind of a waste of good lures when cheaper stuff works just as well.
If you're wanting to make your own, start with surface gliders to get a feel for the skills you need, from carving to wood/hardware choices to finishing/painting skills.
There's lots to read on this site that will help.
Use the search option to find gliders, wood lures, and almost anything else you might need an answer for.
Good luck.
And remember you always need a weak link in the kelp, in case you hook something too big to handle.
I've had to cut big thresher sharks off, or risk losing my rig.
My friend set the hook on a grey whale that was feeding in the kelp.
It was all he could do to cut the line before he got dragged out to sea!