I may give that a go at some point, but the math is still pretty good in my book.
I have a fume hood at home for soldering. Not a lab grade chem resistant job, but plywood with ESD matting and a 600cfm variable speed fan. I have board pre heater, stereo microscope, soldering iron and hot air station all in it. Works great to exhaust any fumes and prevents the wife bitching.
If I don't move all that crap out, just the fumes from the acid will eat the living shit out the equipment. Rusting the hell of it at a minimum. If I go through all that hassle to unplug and move all out everything, the fumes are still likely to eat up the galvanized duct work, steel fan and any other metal part on the way outside. If I'm lucky it will even attack the siding on the house.
I could also go outside, but its winter here and dicking around in the snow doing this isn't my idea of a good time.
All that aside, I could go thru all the hassle only to find out my microscope / camera is utter shit for this type of work making the whole exercise a total waste of time.
If someone else wants to do for $75 and can match their quality, let me know. Thinking of sending another round of samples. Would prefer a US based outfit, but I'm thinking there is a reason China is the only place in town for that price.