I have wanted ot get to Johnstone straight for years now, but there are always so many places to go and different things to do! I find myself going back with my white water boat to surf the amazing standing tidal wave at the Skookemchuck Narrows whenever I want to head in that direction.
Sites to check for paddlers with experience in that area may include:
http://www.wakekayak.org/ My locals.
http://www.washingtonkayakclub.org/ Out of Seattle.
http://www.westcoastpaddler.com/ I've known about for years,a nd have actually seen post on Expo.
http://www.mountaineers.org/ScriptContent/default.cfm A solid organization with a broad scope of expertise and strong survival skills in general.
I've read your Land Crusier build and loved it. Feal free to stop by Bellingham if there is anything you need or just to say hi. Even if you'd like to get some paddling miles in before hand, we have some good paddling here 10 minutes from the house (and can watch the sun set over the Strait of Georgia from the back deck while you make final preperations over a good micro brew).
Cheers, and best of luck,
Life is short, Paddle often
'03 Chevy Astro w/ NP233C 4x4 electronic shift transfer case, 4-5" Overlandvans lift kit, 4:10's w/ Detroit Locker, Rancho 9000 adjustable shocks w/ in-dash remote & onboard air compressor, 255 70R16 AT's or 245/75 16 MT/Rs depending, GTRV pop top w/ sleeper, Carefree Awning, Gaucho couch, Coleman Fridge, and tons of Thule
2010 Gas Gas EC 450, 2005 Gas Gas FSE 450, plated