WOW! i Applaud your effort and i feel your can understand your dalema with the whole apartment living situation.
I say IF you have access to high quality WVO the i say go for it. If you are looking for it to be Clean, Inexpensive or Easy then i say good luck.
I'd say that at warm summer season temps cleaned WVO straight into the diesel tank would be fine up to prolly 50%. No need to pre mix the VO and Diesel. Cleaning the WVO can be easily achieved by cooking the water out at 350-400*f then gravity filtration with this
Greasecar 5-1 Micron Trade Size 1 Large Filter Bag | Greasecar Vegetable Fuel Systems.
For winter use or for more use of the WVO "either transesterification needs to take place to strip the Glycerin molecule from the oil, or a heated piggyback fuel system must be added to inject at (170*F)" With straight SVO.. higher heat the better to avoid bad ash deposits and all of that.
The biggest struggle in the whole deal is getting your hands on good WVO. if you've got that go for it!