Here is a great idea for the bicycle framebuilding hobbyist. It’s no secret that jigs are expensive and this is definitely one of the lowest cost options I have seen so far. The Jiggernaut also looks really cool with the rounded corners and it was also really well thought out in terms of shipping dimensions.
My main concern would be that the MDF would alter over time from heat and moisture exposure, but honestly I’m no expert in the material. But then again if this were made from solid pieces of aluminum, I expect it would cost just as much as other jigs on the market.
Overall, I think it’s a really great idea. Check out the Kickstarter project!