Gene, Looks like your little welding space is working for you.
Only guessing for your "vacuum fume extractor thingie", but I've heard that those Kirby Vacuum Cleaners do everything, especially sucking, ha.
Ya might look at HF for a 8" - ?" diameter exhaust fan, maybe about $50-$80?
Just a thought from your pic, looks like you might be getting some arcing from your weld material to your welding table because of all those little "dingle berries" (weld splatter) stuck to your table?
To correct that condition, if it were me, I'd grind the table surface smooth with maybe a 60-80 grit sanding disc, and/or clamp your weld material to the table/clamp your ground clamp to your weld material.
It looks like a fun learning curve for you.
KC