This is my link to a potato hiller I built and it is what you are looking for. It is an old 2" Ford square toolbar with a shank off a MF harrow as a digger and clamps off the Ford to hold the disc hillers. Typical parts are everywhere.
The Ford toolbar was off a cultivator that will acept the round shank of the disc hillers I bought from Agri-Supply. The big curled MF shank clamps to the toolbar. I just put on the biggest V shovel I could find. That's all.
Now, for fall use I take the stuff off and clamp a few of the curled MF shanks to it with smaller shovels. Depending on spacing it leaves neat hilled rows that hold the ground and, if done again in the Spring, I have planted on and it did well. Water in the trench, plant high and dry.
I have a few more photos if you need them and will be setting it up soon to make some furrows to hold a construction site unfinished lawn for winter.
Agri-Supply is where I got the discs. Made this simple hiller. Works pretty good, as long as the ground is worked. Will hill up about a foot, and leaves 2 furrows on either side of the hill. In the dry summer, I flood the furrows to irrigate the rows. Mark
Below I have a link for what I have done. I designed and buikt it from the stuff I had. buddy of mine gave me two old disk without hub and I did the rest. i ended up beefing it up after where it attaches to the horizontal draw bar. I intend to use it after I till my garden spot nice and fluffy with my tiller and the hipper to make raised bed and furrow on top.