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I would go with minimum tooling as possible as I don’t like to get into that trap of thinking you need to buy gear to get a result. But I would be tig welding it together and maybe tig brazing and therefore not using lugs. So it’s would be tricky to put together without a jig.
It would only be for tacking things in place but with welding you need as minimal gaps as possible, so using a jig of some sort is necessary unfortunately.
The late Ron Cooper...a very well respected frame Builder always built with out jigs and has of the opinion that this method was better as it applied less stress to the frame during construction.