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I've been working on the new switchable rectangular insert for the Saturn launcher base, and it has proven to be complicated to make. But it's nearing completion, just have to finish defining the booster attach nodes in Unity, so here's a WIP preview demo.

This insert is for rockets with large side boosters (SRB/LRB), either the same size as the core (like Falcon Heavy and Delta IV Heavy), or progressing down through 3 smaller sizes.

The overall size of the flame hole (slot?) and the arrangement of the core hold-down supports is selected with the first switcher. The booster supports are chosen with the second switcher, either off or one of 4 sizes (which change depending on the core size selected). The third switcher is for the actual booster hold-down arm attach nodes.