If anyone would know how much would this unit be worth
Unfortunately, that is very location specific, and finding the right buyer. As no one here has approached you about buying it, I'd guess they have no interest. And not knowing your location, we don't know how well the "area" might be interested in the tool.
While I may think that it's cool, I can't buy it because it might tip my garage over, take up half my workbench, etc. so I might not be interested in spending even $50 on it.
Now if you find the right person, like the guy over the hill from me who collects old military vehicles and displays them on his property, you might have better luck.