Mk2 MX5 owner here, got properly up close with the underside of my car for the first time a few weeks back. It quite concerning the first time you see it! Currently on the fence as to searching for a relatively mint Mk1/2 or spending 5-6x more on a Mk4.
This is what's putting me off buying a Mk2 MX5 - seems they're all rotten and the only variable is whether or not you can see it.