On the top one, your rear wheel is too big. unless of course those shocks are rock solid. Go over a big bump and it'll slam straight into the frame. you need either a smaller wheel or to raise the shocks so the frame sits higher. Other than that, great looking...though your custom version is a little...far fetched.
I've been wondering about the shock issue too when I see some of the Japanese custom motorcycle similar to this. Anyway I don't think I'll do this now.The second one is actually for fun.