Here’s the spec sheet:
Each block is 2s10p. 100 Amp max current for 5 minutes or 35 Amp continuous. 7s3p DKblocks (420 cells) would weigh 58 pounds (plus bus bars) and could provide 105 Amps continuous (or 300 Amps for 5 minutes).
I like the design and the ease of reuse/reconfiguration, but it does not look like it would currently be feasible to use on this project.