You are correct JW, funny thing is every one gets into their own favourite 'brew' that works for them... all of which get somewhere near the same result. It's amazing what you can make good fuel out of! In the summer I use chip fat (palm oil) which arrives in a semi solid state, but it makes great BD, you just can't use it in the winter 'cos it goes solid at around +8 deg... clogging the filters etc...
At the momment I use a single drum (120 litre) heat oil mix caustic and methanol, mix in with a pump, settle, drain glyc waste, water wash, dry and winterise if required.
I plan to upgrade to a 200litre drum, condensor, venturi and eductor mixing. May settle for a few weeks rather than water wash before filtering etc...
Just about to start putting workshop together for new set up (been secretly wishing snow would go so I can get on with it!)