Although it might initially work, I think over time and various atmospheric conditions the plastic (depending on what you use) may deteriorate and possibly delaminate. You may be better off getting someone with a lathe to turn one up for you. I did that for my HEQ5Pro, just turned up some scrap mild steel billet, 10 years strong and still going.
Having said that it's an interesting project and I would recommend you giving it a go, but check it carefully. Maybe I can be proven wrong
In that design there are many holes in it, I would remove them and increase the layer thickness to about 5mm or so with as much infill as you can. Experiment on different layer thicknesses and infill.
Please keep us informed of your progress. I have been thinking about getting a 3d printer for a while now. What Printer do you have?