Got it running!
YouTube to the rescue!
Watched a vid on tips n' pointers on cleaning/servicing a 999. Mimicked what I saw... got it cleaned and lubed... applied power while holding it aloft, and the little jenny start sputtering (a first) and before long it was humming with the rods in a swirl. Runs reliably forward, hits neutral reliably... not so reliable reversing (like seldom). The E-unit looks to be sandwiched between the staked frames as well as wrapped. I don't see a way to remove it for servicing. I can see the plunger moving up and down under power... but I guess the pawl isn't catching so as to spin the drum into reverse.
HOWEVER... it runs again!
Now to find/purchase the needed Marx track to complete the set with an oval of track.
Andre