I had a 400/Four in blue back at the start of the 80's, it was my pride and joy for 4 years. I could seriously be tempted to trade in the Blade for some old time nostalgia!
I do see where you're coming from, but its still not quite right. Not Bonneville right. Check out the right hand background of the bottom picture. Now that's a cracking looking bike. Hmmm, my 550/4's still in the back of the garage.