I remember it as I saw it first, and also as I left it. But I can't visualise it now.
As I recall, any heavy duty machinery is out of the question, as the only access is through the house. So forget rotovators.
Given the circumstances, you should perhaps consider finding a cowboy who'll lay turf over anything, without cutlivating.
It will live for a month or so, at this time of year.
Not something I would ever do, nor condone.
Want a cosmetic fix? Buy turf, lay it over anything, arrange to have it watered daily.
Don't even think about re-seeding. You won't have decent grass until next May.
PS I didn't say this, and I'll deny it till the coos come hame!