I have viewed several pictures of the Vancouver (sandcast) bike. The few items on the bike i would consider to be possible sandcast are the following: tach and speedo, upper and lower triple clamp, side covers, maybe fuel tank, oil tank and some small nickel/dime type hardware. The engine is cosmetically an eye sore (makes Markb's engine #100 look good as he found it). Engine cases look to be replacement sandcast cases (unstamped).
The frame and the rest of the bike looks to be a k2 model. The frame has had the vin ground off, you can barely see numbers where the grinding was done. The clutch cover is a ten hole, switches are later versions, carbs are two cable type.