Might want to mention where you are. Somebody local might have a vintage one, or even a used newer one, that they are thinking of selling. My understanding is that shipping gets outrageous.
Price can be another advantage of a vintage one. I picked up a black MBH locally for significantly less than a new one, but not still not super cheap. I also picked up a brown MBH for about the same price, but had a long round trip to Springfield, IL to get it, so you pay for everything one way or another (bigger $ or gas$ +time).
A lot of people believe the daisy wheel vents on the bottom give better control than the ash sweeps & some swear by these for smoking.
With respect to the grates, they are a different size, although I seem to recall someone was making SS versions for them.
My understanding is the old grate straps were basically mounted lower in the bowl than the modern ones, accounting for the change in diameter of the grates. I seem to recall another member mentioning making a small ring out of expanded metal to put over the tabs and resting to hold a normal 26 grate at a height sufficient for it to fit.
If you have local guys in your area that have one, maybe you can convince them to let you try theirs out.