I knew people who struggled with that Andrew Hague jig. They said the design suffered from the fatal flaw that if you needed to change ANY one thing, that it threw EVERYTHING else off.
The more recent Bringheli jig was another marginal and troublesome design.
The one in the picture looks slightly modified from the Hague ones I am familiar with. Could this be a beefed-up copy that Randy Smolenski made ?
Disclaimer - Around 40 years ago I built a jig that was partly inspired by the Hague one. Looking back I spent (wasted would be a more accurate term) an enormous amount of time and energy on that POS.
Almost every single framebuilder I've ever talked to laughs or cries when they talked about their early attempts at jigs and tools. Seems easy. It really isn't.
Save your $ and get the Doug Fattic one, or something more decent, more modern and user-friendly. Use it and then pass it on to someone else and re-coup your investment as best as possible makes a lot more sense than getting something
marginal that you feel bad about selling to some hopeful new hobbiest.
Tough Love, but thats my Dos Centavos