Sir Daniel Fortesque's Height = 247 pixels (White Line) = 167 cm or 1.67 m
Walls's Thickness = 54 pixels (Red Line) = 167*(54/247) = 36.5101215 cm
557 pixels (Green Line) = 167*(557/247) = 376.595142 cm
Initially i tried to scale all the parts of the hole, but i had difficulty pixerscaling the entire thing and i wasn't able to find a video where the hole was show completely, due of this i decided to try to find a bare minimum instead.
Wall's Height = 357 pixels (Green Line) = 376.595142 cm
Wall's Length = 428 pixels (Brown Line) = 376.595142*(428/357) = 451.492215 cm
Volume = 451.492215*376.595142*36.5101215 = 6207807.74 cm^3
Fragmentation = 6207807.74*8 = 49662461.9 Joules = 0.0118696132 Tons of TNT = Small Building level
And considering that the feat should yield far more since i didn't count the remaning parts of the hole to facilitate the pixerscaling and that it was done casually, the feat (along with the Tyrannosaurus Wrecks itself) should be counted as At least Small Building level.