This one used to have front wheels (as did mine years back). Great to have yours converted to hooking to the tractor drawbar as it will be much more versitile. Always had a mind to do the same with mine.
The platform for the blade runner is only room for one (except I had my two small boys riding there with one for each height wheel). When they were pulled by horses, then there were adjusment levers up front too, over the front wheels, where the horse driver could also help. It was a two-man operation.
Wrecked mine when someone was pulling it fast, and the bumps caused the blade to drop to the ground and bent things up.
I see from the pics, that chains were used to hold the angle of the blade (I had to do that too when the adjusting pins on the quadrant wore out the rusted steel). For leveling a gravel road, they are priceless.
From your request for more info, I wonder if you are going to try to find parts?