The cost? No I don't mind. It was a "barn find". $350.00 for the tub, frame and mounting hardware. Came with the wheel upgrade to wider tire. Had to have swing arm worked on to fit new axel added $175.00. Was flat gray, paint to match bike added $75.00. New seat is a boat seat at $50.00. New front mount $60.00. So around 700 bucks. Java makes Velorex and there's several models. 562 is the basic model.
New sidecars range from $2000 to $8-9000. Google "motorcycle sidecar vendors" you'll see Rocket, Hannigan etc. Try CycleTrader and even eBay. You'll find nice European tubs there for 3-500 bucks but 2000 shipping!
I've attached the Velorex install pdf so you can see what's required for attaching and aligning a sidecar. All pretty much attach the same. Whoops file is too large. Google "mounting a sidecar if you're interested. Takes time but isn't hard to do.
If you get one, you'll scare the bejusus out of yourself every ride for the first couple of weeks until you unlearn motorcycle habits. But once you get on to handling you'll love it. 120 pounds of ballast works wonders. Out for a ride and suddenly need to stop at the store? No problem! You'd be amazed at the volume of groceries you can put in the car. (downside, you'll probably go to the store more often instead of the wife!)
Caveat. NO passengers on the bike. You'll need to keep that side as light as possible.
Again the VN750 isn't that "friendly" to mounting a sidecar. You will have to make a front bottom frame mount. The rear mounts will go on as will the front top mount but frame mounts, the radiator and lower cooling hose make the front bottom mount impossible to fit. Even so, go for it!
Velorex 562 sidecar w/trunk
Headlight power switch
Manual fan switch
Blue wire mod
Yellow wire mod
Voltmeter relay wired
Coils direct wired w/relay
extended foot shift
extended brake pedal