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I think it's an absolute truth in nature that water is king- there really is almost nothing that it can't permeate, given enough time. Fiberglass is conveniently light, strong and impervious to it in the short term [25-50 years]
I posted my thoughts and remedy about Montauk bilge drains a while back on the "other" BW site.
The brass tube system seems a little 'cave-man' and, from my pov, could be improved by installing a fiberglass tube, faired into the transom and bilge sump walls. I did this on my 1987 Custom 17 in the bilge and splash well drains too.
The only difficult part was to find an ID of f/glass tube that would accommodate a standard drain plug [7/8 to 1"]. I ended up using 1/8" wall tube that measured about 1" ID, and since it was faired in with Westsystem, the 1" id got reduced to fit a 1" plug perfectly.
The tube source was from a small company in Santa Ana, CA that makes fishing accessories: Pacific Marine Products.
In this case the company makes gaff handles from the 1" tubing.
It required an oversize drill thru of the original drain hole, then f/glass cloth wraps around the tubing ends to set it structurally into the transom and sump walls. The rest is just fairing w/thickened Westsystem, then sand and finish. By making this mod, I'll never have to think about that nifty brass tube design BW implemented way back when.
In my case, I intended to leave this hull in the Pacific and knew it wouldn't take long for the salt water and stray electric currents in the marina to waste those nifty brass tubes- maybe 6 mo's.
When I executed this modification, I had the great surprise of drilling into dry foam at the drains, even though the deck had at least 50 screw holes, both made by PO and BW when they first rigged this 1987 17' SuperSport. Add to this that the deck gelcoat was spider web cracked in several locations from standing water.
This hull must have been kept somewhere hot, inland in So Cal. for the foam to be so dry.
Eventhough I sanded, primed and Epoxy barrier coated the hulls' gelcoat before bottom paint, it wouldn't surprise me if the hull develops gelcoat blisters in less than ten years in the Pacific [if not, then BW laid up a great f/glass laminate schedule].
The good news is that I know how to fill, fair and recoat those issues when they develop in the future, since we all know water will always win- it's just a matter of time.
Joe