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Yes ovalised top tube.
I haven't done much research on this so I don't know. I have made two jigs now and bought one second hand which was made by a Danish bloke.
I seem to remember that The Bicycle Academy was starting to sell jigs. Maybe that's best value if you live i UK.
My dream is the Anvil system with argon back purge. But as long as you are just building for yourself or friends for free like I do you can get away with anything. Precision comes with practise and thoroughness.
My first bike was the cargo bike I built back in 2013 and that was constructed using laser cut ply wood jigs and strings for alignment :)
Are you doing ovalised this time too?
Can you recommend a budget ready made jigg?