is it possible to turn a unit back into a nanoframe?
I tried
Spring.SetUnitHealth (unitID, {build =0.5})
but it does not turn into a nanoframe (healtbar widget shows buildprogress as 50% though)

I know this may be redundant and useless info, but I recall CA had incremental reclaim of stuff where the stuff turned back into nanoframes.

ZK Still has it

when creating a unit you can set the build parameter to true like this:
Spring.CreateUnit (bdefID, x,y,z, i, teamID, true)
and it will be nanoframe.
I thought the parameters at end were a table..thanks Rafal[0K] for pointing out

so for now that is good enough for me.