I have harvested it, and tasted the juice.
I found it to be grapefruit like, very tasty, and not bitter or even overly tart, but I also eat lemons out of hand.
There is tree (bush) growing right near my university campus.
I found rolling it between two hard surfaces increased the juice released.
I'm not sure about the resin, I really didn't notice it.
I think it must be in the rind.
I tried to grow it from seed and cuttings, but this spring I bought one from the Growing Value
Permaculture nursery, here in town.
There are some studies that warn about the dangers of using the extracts of this plant, but given its history of use, I'm not too worried.
I won't be concentrating the pulp or juice so much as I will be diluting it.
I plan on using the pulp for juice and using that juice for drinks and for pickling.
I will be squeezing each orange and cooking the left over bits down for the oil/resin.
That product will be tested for flammability, usefulness as a natural glue, pest deterrent, etc.
Evidently the resin is soluble in alcohol, but not easily removed by
water.