that strut top is an easy fix as they go but it dosent involve krust.
i would drill out the spot welds and remove the one pannel, then cut out all of the affected metal on the arch itself then replace with good metal from ether a reapir pannel or another shell, then clen up and reinstall the removed pannel. proably tig the lot now for neater welds so less work to do to make it look untouched