Hey Duff,Welcome, I know Eugene's bait boxes and they're built better than the original factory boxes, Scotty (gran398) has a pair of them on his 22-2 and they are stout compared to my originals on my 22-2, we used to dive off of them when I was a kid, climb on them everything you can imagine but.... there is no coring in either version and I'm thinking those stresses from a power pole will eventually spiderweb and crack that 1/4-3/8" thick glass box at the mounting points. I'm assuming you lag bolted the boxes to the transom, just like the factory did or did you through bolt the top attachment points above the floor height? Eugene will lend his advice as soon as he reads this I'm sure. I know you dont have a lot of room for an alternative mounting point without the engine cowling hitting the powerpole when turned. If you have a jackplate on the engine, I have seen adapter kits that allow mounting it to the jackplate that have enough offset to allow the engine to turn without hitting it and still may clear the bait box.
I still have to drill the engine mounting holes and I am not looking forward to drilling them with my 1/2" drill and spade bits.
A bubby of mine whined about how slow the hole saws were because the teeth always filled with chips.. He had never heard of drilling a clearance hole with a twist drill along the inside of the hole circumferance.. What a differance that makes!