You don’t need to do funky trees to make custom bombs. For dumb bombs, all you do is take a detacher, disable it (so you don’t accidentally activate it), attach the default bomb underneath, and then build your own custom bomb. Once you’re done making your bomb, you attach it to the back of the detacher. From there, all you need to do is nudge the bomb’s body over the default bomb with fine tuner. Guided bombs are little trickier, since you have to switch out the bomb underneath for a missile. The rest works the same. This method works for custom missiles too.
You don’t need to do funky trees to make custom bombs. For dumb bombs, all you do is take a detacher, disable it (so you don’t accidentally activate it), attach the default bomb underneath, and then build your own custom bomb. Once you’re done making your bomb, you attach it to the back of the detacher. From there, all you need to do is nudge the bomb’s body over the default bomb with fine tuner. Guided bombs are little trickier, since you have to switch out the bomb underneath for a missile. The rest works the same. This method works for custom missiles too.