This is based on Alex Schomburg's cover artwork for the November 1964 issue of
Amazing Stories. The issue can be read
here.The artwork for the cover story is of a completely different design:

Ignore the fact that the astronaut's face plate seems to be open. Nothing like fresh vacuum in your face while cruisin' the lunar plains! It took a while to figure out how this hopper is supposed to be controlled. I think the astronaut uses his feet (!) to swivel the engine port and starboard, and maybe in pitch. No idea how yaw would work. I had to make some guesses about the hidden structure, but here's the first 3D iteration:
Not a perfect match, but OK-ish:

I used a scaled drawing of a seated astronaut to get an idea of where the seat and controls should be placed. It's slightly different than the artwork.



I made some 1/35 diamond plate. It should be interesting to see if it prints:

It looks like I'll be able to fit 4-6 of these on my Saturn 8K's build plate, but the vehicle disappears inside a forest of supports.