6) I think you over estimate the size of 1900 era battleships or 1914 era battleships. They were among the largest ships of that time but not larger than Ocean liners
The SS Rotterdam was the largest ship in Dutch service
She wasn't built at home but rather by Harland and Wolff in Belfast. I don't think the Dutch have the actual capability to build a ship that's Super-Dreadnought sized, not without massively expanding their shipyards and docks at home first. And if they're for service in the DEI, then they NEED facilities built there too so you can maintain and repair them. Unless you plan on sending them home every time they need a refit.
Its no use coming up with the design if you can't actually build them or support them. And building and enlarging drydocks and slips to fit a super dreadnought sized ship is going to be a very very expensive investment.
Also who would design the ships? Would the dutch do it? If so, they've had no experience in designing a Super Dread type ship, or anything bigger as a Warship than a pre-dreadnought. So you need to look overseas IE Germany and UK or maybe the US for design assistance. Its a big leap going from building a pre-dreadnought, skipping a step and then going all the way to super-dreads with zero experience in designing or building them.