"What's up guys"
For me, the "whats up" is that I have absolutely no idea what schematic you are playing with, or what you are trying to do - and I cant see your picture.
Also - Questions like "Is a 8 ohm speaker too "heavy" for the circuit to push?" are really not encouraging - Sorry, but if your level of understanding is so low, you really need to study elementary electronics before you undertake a task like theremin building.
I am not trying to be nasty here - just pragmatic.. I hate to see someone languishing without replies here, but I can see why you are getting so few!
My advice is - Spend a bit more time on your postings - we are not telepathic! - Put schematics up at least (actually attaching a picture is much better than a link to some site which forces you to watch adverts or register) -
Fred.