Tim,
Yes stainless steel rivets do require Durlac (Yellow staff). Monel rivets are a good alternative. One small thing 3/16 is all but 5mm I personally would be a little concerned if you are using 4mm. I have seen rivets share off holding things like diamond wire tangs, we drill a extra hole in each tangs for a third rivet because two will give up in the right conditions.
We are building three new boats at the moment, two have been sold and the third is the Association Hulls waiting for a crew. Sorry all hard to get Boyer white. The only change we have made is the mast rotation. We are using the same system as First Try so the rotation can be adjusted from the wire. The Hull Builder is Jim Boyer himself, we have one set of hulls ready for beaming this weekend and the second set will be ready in a couple of weeks. The seam will be fared out so not visible. Rudders and centre board on one boat are from Joe in Bendigo using Jim's moulds and the other will have Tony's latest centre boards and imported rudders. It will be interesting to see the difference. One Boat will be sloop but raced in cat configuration most of the time by a new skipper to Mossie’s with many years of experience in cats and other will be cat rigg with kit. We are also beaming up a new set of Chris hulls with a little luck in time for NSW. Sailing in Central Vic is the same as last year with wheels. Although Waranga Basin may be sailable. The first time anyone will see us on the water will be NSW for there states if we get there, other wise see you a McCrae in November.

Peter