Off the shelf tech is what allows Massdrop to be what they are.. bringing products to the Masses. You think the 789 is some sort of mythical custom solution or something, when in fact all of its parts are essentially off the shelf, their implementation from THX's AAA philosophy with feed forward error correction (a sort of null wave test that then filters distortion at the end of the chain) is what allows it to be as good as it is(the second and arguably more miraculous portion is it's efficiency, the numbers with respect to energy usage are unbelievably with respect to wattage). It's not some insane boutique hardware implementation containing an FPGA.
THX is responsible for all the legwork here. With respect especially to the power delivery implementation and the genius philosophical design of approaching the efficiency vs sound fidelity aspects. One of the chief architects spoke about how they focused simply on the analogue portion of audio as addressing the digital portion was not an issue they were trying to solve for their internal systems of heat and such. He spoke about how this was enough work as it is, and they didn't have much interest at the time addressing DACs (naturally as it seems DACs in generally presently don't have as much of a bottleneck and issues as pure analogue AMPs do, and did).
So when you ask for a DAC from Massdrop, you have to specify why you're looking for this. If you're simply looking for the same sort of enclosure for aesthetic purposes to match a stack. That is understandable. If you're looking for performance, then you're wasting your time with desires of botique FPGA implementation desires. ESS/AKG have wonderful DAC chips (with some insanely low distortion numbers with their latest chip specifications that should be hitting products at latter half of this year and going into the next year). Aside from the ESS "hump" that engineers are now actively looking to sort out, DAC's are reaching numbers where inaudibility will be commonplace.