Sure, if we had a production line and we're going to build 300 airframes we'd make custom formed gussets for each one. Why not? We've got that big press just sitting there and it will make alignment easier during the build. Likewise with the precisely fitted tubes: jig it once, then cut 300 of them that will be perfect. Buiding one airplane in a garage, we'd like to do something more efficiently for the conditions we are in. Luckily, with today's technology, we can have flat or ready-to-bend brackets waterjet cut quickly and at low expense. Apples to apples: Wel.... er..."heat bonded" space frames go together quickly in a factory where there are jigs and fixtures that make things easy.