it weighs 11.5 kilograms (about 25 pounds) for comparison a 100ah battleborn weighs 31 pounds. I always do weigh comparison when dealing with lithium, some generic cells weigh less then genuine cells.
I would have to see the inside of the battery to decide if its worth it. Someone like battleborn uses high quality cells on their lifepo4, someone from overseas might use grade b or c cells. You might end up with balancing problems which the bms will coverup with less capacity.
For DIY secondlifestorage is a good site. Using the large lifepo4 prismatic is as easy as it gets, just 4 big cells to get 12 volts. My 220 ah lifpeo4 which I built, has 160 cells tab welded together, 4 cells would be too easy.