I built one of these in 2020, and was fortunate to get the case, knobs and other parts as shown. I initially thought it would be an easy weekend build, but it took me considerably longer, and the cost, not including my labor, was not trivial.
http://www.signaltransfer.freeuk.com/preamp.htm
But while I didn't get balanced i/o or remote control, I got a parametric equalizer, mm/mc phono, a processor loop, and a headphone amplifier. When you build something like this, you really begin to appreciate how costly parts like relays, film capacitors and heatsinks can be.
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