I installed Yakima pegs in my WD12 and am VERY happy with them.  I wanted a really solid brace and I really liked how positive the lock was as well as the strength of the channel.  I’m sure there are lighter ones on the market but I did not want to ruin the feel of the boat with a foot peg that did not feel secure.  A small price to pay in my opinion.  I think I finished about 48lbs. and that was with a 4mm deck.

I think when you get into ergonomics of the boat (seat, pegs) those are the things that could easily spoil the experience.

I used these nylon ones:

http://www.duckworksbbs.com/hardware/canoe-kayak/footbrace/index.htm

I like them, they are easily adjustable from the cockpit and have a comfortable footpad.  

Here is a list of weights, coutresy of the CLC Postal scale.

Adjustable aluminum- 1.1lbs

Smart Track footbraces- 1.75lbs

Smart Track Premium Aliminum- 2.1lbs

Keepers Footbraces- .75 lbs

Sea Dog adjustable Footbraces 1.4 lbs (per sea dog web specs)

As you can see, Keepers are the lightest of the bunch, but I doubt you will feel the difference when lifting your Duck.

Thanks so much. Excellent customer service to weigh those things!  

Appears nothing would be saved by changing footbraces.  Routed 3 ounces from the hatch doubler yesterday afternoon.  End pours came out too big and heavy, so need to crawl in there with a dremel (and respirator!!) to shave a few ounces there.  May be getting a bit obsessive at that point.  Nothing a Sassfras 12 wouldn't rectify. Hmm...time for the next build?? :-) 

Closed cell foam blocks, glued to the side wall or the bulkhead at a length comfortable for you.

So far those are the lightest footbraces I've found or heard about.

FrankP