: I'm thinking about a redwood hull, walnut from the sheer up a way, a
: pin-stripe of white stuff, then a pin of purpleheart, then a deck of white
: like a field of fresh snow.

Mike, I have found yellow cedar to make good, wiry, and flexible pinstripes with good contrast. Of course if you already have a supply of something light colored like pine you can use that. Pinstriping is really pretty easy and adds richness to a design withour looking fussy, even for a simple pattern. As far a walnut goes, I have found that regular black walnut does not darken up as much when the resin hits as does redwood and WRC. The result is that dark WRC will not have much contrast with the walnut after completion. So if you are looking for a nice dark wood, darker than the redwood, consider using Peruvian walnut. For an example of Peruvian walnut, see Joe's King on his website (http://www.redfishkayak.com/).
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:Cockpit cutdown of white stuff, coaming of
: white stuff, too. A solid walnut bow like the mahogany one somebody had
: posted for the deck to but against, a solid walnut stern. Inside, carbon
: fiber for contrast and stiffness. What do you think?

I'm not sure I understand where you intend to use the carbon fiber. I have used it to good effect in spot locations and for things like brackets. After reading the article in Sail Mag I'm more inclined to use s-glass than carbon for hull or deck reinforcement.
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: Also, I think those flush deck fittings just won't do it: they hang down
: inside like stalagtites making loading gear frustrating for a guy like me.

Which flush fittings are you talking about, Joe's? I have some of Joe's style and they are almost flush inside. They cause no problems at all stuffing a boat completely full.
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: Also going to put a hatch on the forward bulkhead just to make tweaking
: the foot pegs and rudder easier. I'm not sure about the magnets...too many
: waves I've punched through that have stripped things off magically.

There's no doubt you spend a lot of time playing in the waves so you have a lot of experience. For the much more protected waters of Puget Sound I love my magnetic hatches. It's so easy for a paddling partner to get in and out of my hatch for some food or clothes in a flash while on the water. You could do a hybrid approach, using magnets for normal stuff but include a fitting on either side of the hatch to hook an additional strap for rougher water.
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: Almost done with the design though...

Is this your own hull design?

Cheers,
Ted