New DIY DAC, some thoughts, ESS or AKM or staying true to the old school

Output impedance is 380 ohms BUT +/- 15%. Hope that it not between the channels in the same chip but just different series of bunch... 🙁

You can count on that. The spread between components on the same chip is always much smaller than between components on different chips, especially when those different chips are from different batches.
 
Still, it seems like quality 1794 dac kits are liked a lot by a lot of people, but the good kits cost more than 200 Euros. One example: https://audio-creativeshop.nl/product/dddac-1794-mk3-module/ ...only € 458,68 (€ 555,00 incl. VAT). (power supply kit available at extra cost)

Yet, for some reason there isn't so much interest Marcel's RTZ dac. Maybe some change on that when a final most recommended output stage is settled on. However, like all things people spend money on, there has to be a compelling story, and there have to be enough in the way of positive reviews.
I bought a dual 1794 kit for the usual source and I do like what I am hearing. (I bought the version with just the dacs fitted, and no opamps so I could use my differential to se IV transformers)