too much time?
no.. you have too much space! I can't imagine having that many freewheels disassembled at the same time!
I think you are just tempting fate... an inadvertent trip could send all of those 1/8" bearings straight into that drain! (at least that would happen if I tried it)

When I've opened up a Perfect or Pro-Compe, I didn't have much trouble getting them back together. A bit of care when rotating the outer body CCW got the pawls to move inwards and allow the two halves to mate together. How are the other brands in this regard? I recall hearing stories of needing to use some thread to keep the pawls retracted during the reassembly process.

Like a lot of bike maintenance activities, it's not bad to just open up a freewheel and go through this process. It really isn't that bad (for SunTours, at least), and will build some confidence and courage for other work.
oh... did you have a proper pin wrench for getting the locknuts off? I've used a drift punch and hammer, which isn't ideal, but seems to work. I've since bought a Park pin wrench, but it is a bit flexible and can't produce enough torque before the pins pop out of the holes.
edit: looking at the photo again, I see both the hammer & punch and a Park pin tool.

Steve in Peoria