There are two methods of nanobot self assembly, maybe more.

One well known one, is to bind bacteria in it recombinant phase, to certain aspects of media machine or some such similar devices, as Buckeyballs, (small structures that can be compiled, to make larger micro structures).

In macro, larger nanobots can assemble lot legs and propulsors, from a media dump.

The first example, is to DNA encode the sub assembly procedure, to recognize the buckeyballs as objects of ob.ortho-linnearity.
So in the same fashion as how crystal medium would be presented as structured crystal growth, say in the accumulated spry of hard mineral water, on the rocks near a fountain, the DNA direction, by genetic engineering, would decide the objects to be built.
*These structures, would more than likely be simplistic via their asked natures.
+A DNA programmed stop,. is applied via engineering to the lineation of the ob-ortho-objective, once this objective has been measured as done, then realized as feedback, through a liquid media RNA similar indicator, for the DNA designed command process, to stop.

The second process, in micro machine macro, is a confluence liquid gel media, that is applied after certain parts, such as a brain, servo features such as legs and other asked to task features, then instillation of these components within the insect shell, are completed.

This second ruse illustrated, is simply expressed as nanocreators, go to media parts dump, retrieve shell, take to staging area.shell placed on its back, spinal column, brain, musculature gathered.
*master assembler with micro assistants inserts these feature parts into shell, then nonactivatred microbot is taken to (spark of life theater), to where mild electric shock activates creature.

This process may take anywhere, from one half hour, to an hour depending on the complexity of the asked to be assembled creature.

>>A master assembly boss mini-super communicator computer, directs any needed asked task, by the macro nanobots, if the need arises.

Memory in Marco nanobots, might not be wise to house all assembly procedures, within the shells, of the macro-nano-bots?!

FUTURE:In time, if the internal gel media of the macrobots, becomes self biological as realized by the creature. Then a dependence placed on the mini-super-computer-tower, as placed in the filed, might be lessened.

This principle might world, one light year from Earth, as well as one thousand light years or more away from Earth...Colony, self sufficient, however communicative.