You could try creating a plastic slurry. Take some acetone (mom's nail polish remover) and drop some bits of plastic in it. Once it melts, use a toothpick and smear it inside the holes. Some plastic doesn't melt with acetone though. Find some that does.
You don't have to mount it in mid configuration. And you can make the RPM wheelie bar mount work with an extra bushing. See my build thread on the drag Slash for more info 😉
Get the Hot Racing aluminum trans case. Or even their plastic one is better than the OEM one.
He's referring to the screws that mount the shock tower to the transmission. Not the shock mounting screws.