Grind away part of deck stringer to install backing plate?

[memelet]

Not too late all!

Even with the the buildup, I will still need to mount one of the bolts right thru the stringer. Should I avoid that all costs or will the build up account for that? If so, I will be over drilling and filling with epoxy. I can stop at the inner glass (pretty easy with forstner bit), or should I go all thru the stringer? I'm assuming the stringer is wood encased in epoxy.

Also, for the buildup: I'm assuming it is ok to use G10 for the base, epoxied in place. No?

BTW in case I was not clear, the stringer runs parallel to the toerail about 12 inches inboard. Its roughly 2" wide and 0.5" deep.

Thanks!