After I "blew up" my first effort by applying the power supply voltage the wrong way around, I designed version 2.0 adding many improvements, (and renamed it ZX81+35 because we are a year later now ) and yesterday I was rewarded with the first sign of life from it.
Its still far from perfect, in fact the keyboard was all wired up wrong (manual wiring) so I had a hard time to even enter
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10 PRINT "HALLO WORLD"
if you want to know more about my effort you can read it on my webpage, here: https://revspace.nl/ZX81%2B34