BrianO, if you fancy that for yourself, and you know where you are with weight, fragility of seals, etc - go for it!
I suspect that spending even that much would put off most beekeepers!
And that few beekeepers would have the opportunity of acquiring such a thing at cost price.
But if its your trade, it would be an opportunity to add your personal touch to your hives.
A no-hole board is just fine for most of the year. But a feeder board (with one or more holes) is needed for some feeder designs - but not if you have a Miller or Ashforth type.
Most hobby beekeepers would probably have a ply cover board, with holes for using either a contact or a rapid-type feeder.
For clearing full honey supers of bees (just before removing them), a clearer board is used. This would often be the same ply board with a couple of Porter escapes plugged into those same holes ...
My (ply) "rhombus escape" clearer boards are quicker than porters (just a few hours) and much less fuss. My clear boards stay above the supers, so I can see when they are free of bees ...
For a "top-beespace" hive the cover board can be flat. But for bottom-beespace designs (like the standard National) it needs an 8mm tall rim under the edges of the 'board' - this is usually achieved by a small frame round the cover board.
My suggestion, BrianO, for what ever little its worth, is that you file the thought away until 1- you have handled a live colony, and have some feel for the ruggedness expected, and 2- you have chosen a hive format (and 3 - you've completed your course and understand about the beespace!)
If you do go for it, many here would be interested in learning how you get on.