Not bad should be really fun.
Few things to help out from things I have learned from friends builds and mine.
The jack shaft slack will drive you nuts!
Since you are using an 83 big red you have to be really careful on the chain to prevent breaking the case or wearing it.
The bw200 inner sprockets are 530 not 520 chain. Not sure if they make a 530 front for the 83 or if the 530 chain will clear the case inside.
Might want to check. You can always cut the inner jack shaft sprocket down to a 520 but trust me, try to keep 530 on it.
That chain is really under stress on speed changes and with the case being so closed in the risk is much more.
The 200m my bud has broke many a front chain.
My bw200 has not broken the front on me. Slack on it really annoys me riding it.
Noisy and jerky!
Try to get the angle of the swing arm pivot, front sprocket, and jack shaft all in a straight row.
tack the bits in place and sit on the rear and see your alignment with the shocks compressed.
The chain will always rub the guide on the swing arm but you can move the shock mounts around or the pivot to make it not rub most of the time.
Saw one recently on a ride. Really neat way they did it up.
They added a little plate to move the pivot back 3 inches and 3 beefy chain rollers right in front of the pivot as chain guides.
One in the middle of the chain, one above, one below.
This way the chain will never rub the swing arm and will stay tight in a line.
As the arm drops the lower and center wheel hold the chain in place for the shaft.
The front end will need work.
Rode one that the guy cut the neck and pushed the front end out a few degrees. Guessing 5 or so.
The bike was really twitchy and hard to control in rough stuff with the stock 3 wheeler nearly vertical rake.
Flipping the forks around helped.
Adding length to the forks really helps as well.
The one I just saw had the kawasaki front end on it.
They cut and extended it to make level the bike for the front is already low and the frame rake made it lower.
Like this front end but with 3 inches added to it.
http://www.3wheelerworld.com/oldsite...0bklt200cB.jpg