The advice to seek out an enlarger is a good one.
That said, I made a simple, but functional enlarger using my speed graphic a number of years ago.
I found a coffee can that fit over the opened hood of the grafloc back. I cut a piece of black mat board to cover the end of the can with a rectangle cut out to fit over the hood, taped it to the can. I spray painted the inside of the can white, and mounted a bulb and fixture in the other end. This was the light source.
For a negative carrier, I took a funky film holder and removed the metal piece that separates the two pieces of film. To use it, the negative slid in just like you were loading a film holder, popped in the back just as if you were loading a holder to take a photo.
I set it up on a table facing a wall, put the paper on the wall.
It worked better than you would think, but was hardly ideal. I was using the same 127 ektar to enlarge with that shot the picture, and alignment was tough.
If I were to do it now, I would make an led light source like others here have, and build a vertical structure the camera could mount to, with a baseboard and all.
Unless you just wanted a project, it would be much less hassle to find a D2 somewhere. They are cheap anymore.