I have what I think is one (99% sure). I got it off ebay a while back. Yes, it needs modification. The tank mounts on mine don't work for a 750. A mount for the rear is in place, but it is not a stock type mount. The tank is longer, so you would have to figure something out on the frame or tank anyway. As far as the craftsmanship, it's pretty good. It's not 100% perfectly symmetrical and some of the edges leave a little to be desired. I paid $500 bucks for mine, so I couldn't complain too much. This is my first alloy tank, so I am not really sure what gauge metal is typically used. To me, it seems like it is a bit "soft". But, I think it is a very fair deal for the price. Mine came polished and while it's not 100% mirror polish, it doesn't allow to hide any defect.
I'd rate my tank a 7.5 out of 10. I've seen show tanks made by my buddy Fuller, so I know what a 10 looks like.
For the price, I think it is definitely a fair deal.