Re: adding a live well
Livewell fill pumps have a threaded intake that is a thru-transom fitting....drill your hole, coat the intake with 5200, put more 5200 on the inside & outside, then a nut goes on the outside holding the pump to the transom. Wipe off the excess 5200 and cut off the excess pipe with a PVC pipe cutter or hacksaw or whatever you have. The pump discharge usually has hose threads, might have a barb fitting whatever, you can find plumbing adapters to make what you want. My boat has regular garden hose, been that way for 28 years.
The livewell, you can build it in just like snake described, that's how mine was done by the dealer back in 1980. There's a 3/8" hole in the bottom of the boat, so unless I put a plug in it, the livewell always fills to the waterline. Also a overflow hole in the side of the boat a few inches above the waterline. The more empty space above the waterline, the more oxygen will be available to the fish in there. The fill pump discharge should flow through a sprayer bar or some other kind of diffuserto maximize oxygen content.
A pump-out pump was added to my livewell, just a submergible pump with the discharge pointing out the overflow hole. Better for the fish as you can pump bad water out and good water in.
If your livewell doesn't sit on the floor of the boat and you don't want to drill an overflow hole in the side, many boats have a standpipe overflow tube, with plumbing under the livewell leading to a thru-transom drain hole. You just turn on the fill pump and let it overflow, to keep fresh water in the livewell.
Even though my overflow hole is above the waterline, when cruising in high waves enough water comes in the overflow to overflow the top of the livewell and fill the boat, is another reason I need the pump-out. Not a malfunction...more of a design flaw...or misapplication - my boat maybe was meant for calm water.
