dash frame removal

OK those bolts under that gasket are installed from top down through U nuts.
There was a guy here who stated he defeated those nuts from underneath.
He then pulled the dash and the remains of the bolts out from under the windshield gasket. To reinstall he placed new U nuts under the gasket and installed short bolts from the bottom up.
It does sound good but is it a good plan ?
I think there are 5 bolts to cut away under there. None would be easy to access unless you're willing to gut it, column, pedals, heater case.