Didn't think about a grinder, but the way I was gonna get it done was to make it all closed so no screws or bolts would be sticking out. I would CNC it at work; never tried to grind 65+ HRC, apart from on surface grinders. Not sure how a cordless grinder would cope with a few inches of steel.
But I see some points; it's not gonna make much difference if you tow it. And if that's the case, no point drawing it on CAD.
But cheers for your input
Cheers for the feedback was an idea had while at work. Wasn’t sure how much difference it would make while towing or pulling from the towpath