snal-
My 1987 Cruiser has a baitwell built into the port lazarette locker.
I'm sure the locker was designed for it, as it is all sealed properly, etc.
I don't know if the original owner installed the plumbing, or if it was a factory option at the time.
The well works well with small baitfish, but is not large enough for anchovies and sardines or any other fish that have to have a light above to simulate the sun and be circular in shape for the fish to swim in schooled circular patterns.
Mine has (starting at the bottom intake, hoses omitted):
1. A through hull near the center of the transom and below the waterline (works at rest to intake water, but must be sealed off by the valve under the tank underway when planning).
2. A Bait Well Pump to supply the well.
3. A valve underneath and through the bottom of the tank to serve as an inlet and to shut off the water supply so the tank won't drain when the pump is off. (Can be opened to do so when desired to help drain tank.) Valve is near the front of the tank for easy access.
4. A backup overflow through hull fitting near the rear and outside of the tank.
5. A through hull fitting at the bottom of the tank and another through the hull at the side to allow water to drain out the tank at the desired level. The level is controlled by a PVC pile tapered and inserted into the through hull; its length determines the water level. Remove the tube to drain the tank.
6. An electric switch on the inside face of the motor well next to the well controls the Baitwell Input Pump.
I don't have a separate aerator, relying on fresh water circulation, but one might be desirable, depending on your conditions.
You can probably do this for about $100-150, depending on where you buy the materials. A nice day's work, roughly!
There are ready-made tanks available, of course, but they take up floor space, although you might not have a choice if you need a big circular tank. Probably would be pretty akward on the swimstep!?!
Hope this helps!
Joe. :teeth