The steel I ordered came to €125 from metal supermarkets. Pretty steep I thought, but I guess the price of metals has gone crazy lately.
This is going to be good exercise, as I have no power hacksaw, and my mill is in a friends shed an hour out of town. I'll start by sawing as much as I can and make the parts I can on the lathe here, then go and finish the milled bits.
These are going to be the end plates.