better construction

[kaora]

in the current game you can't link 2 body at 2 point

i try to make a ship that start like a big H but needed some more support to i put another link to support the 2 side rocket to the middle one, but when i attach the 2 external to the middle one it would only attache to the one the mouse over. meaning the second link is ignored and rocket just go thought ( would provide a screenshot when i can had one)

It would be good to make either that when a structure part can attach to the 2 part it is betwen, or to have an option to manualy selection what is linked ( if close enought to avoid magical link from nowhere)

[sumghai]

That's because KSP crafts are built using a "tree" architecture, where one cannot have closed loops (the exception being struts and fuel lines, which operate under completely different rules).

The current building system is mostly adequate - just use more struts or simplify your design.

[pizzaoverhead]

You also can't have a Y-shaped design, where multiple fuel tanks feed into a single engine. The devs have talked about overhauling the part tree system for a while now, but I'm guessing working on career mode is more important to them at the moment. You can already have multiple attachment points using docking ports.