Another thought is to put the donor kettle on the inside. That would need to have the 3 individual leg socket holes cut open a little bit to accommodate the donor's legs sticking through. Not cutting the entire bottom out just the 3 holes the new leg sockets need. I'd never suggest hacking a kettle of this caliber, only minor modifications that'll extend its use. I dont think it can be put back on its own set of legs again without some constructive damage.You could still use the vents for your boltup but I'd recommend using SS fender washers and either elliptical or distorted thread lock nuts on the inside. Those lock nuts dont have any plastic and theyll never loosen without a tool. All while being loose enough for the wheels to turn and not do any damage to the porcelain.If you went that route.On George's original kettle he had a nest for the kettle to sit in and that would be fairly cheap and easy alternative that'll buy you time to get more ideas and input before you do anything. I imagine if you want to cook on it right now you could set it in another kettle, on its handles, and cook.And if you do rehab the rusty relic from the inside the fix would be damn near as invisible as a nun's nipples after you paint her leg sockets.Or you can send it to me and you wont have anything to worry about.