Protobodobodyne inside cargo bay as primary control?

[AaronLS]

I can put a protobodobodyne as the first item to be primary controller for a space plane, attach a mk2 fuselage to it, then try to attached a cargo bay on the side of the fuselage such that the proto is inside the cargo bay. Basically a MK2 drone without access to the part intended for the Mk2 yet. However, the cargo bay snaps and I click, but it is highlighted red and doesn't actually attach.

I can build off a regular cockpit, add then add the proto to it, but if I delete the cockpit then it disables the whole build and doesn't let me make the proto the primary.

Is there a way to switch the primary cockpit midbuild?

Edited May 5, 2015 by AaronLS

[Wanderfound]

Change the root part; either press "4" or use the bit up with the translation/rotation icons. Then select the fuselage, then the probe core.

[AaronLS]

Ah, somehow I've never used that button before. Thanks!