I will give a tip: Even a bass with fretlines needs you to understand and adapt technique to hit the sweet spot. The line is 2mm, your finger is up to 2 cm wide so to be in tune means finding the correct spot for your finger to push the string against the fretboard. How meaty (the part of) your finger is, how you hold your fingers etc has an impact and you need to compensate accordingly.
Use your ears for that.
I find I am in tune when I have the edge of my pinkey on the fretline (boney) but that my index hits the spot when positioned with the fretline towards the middle of the finger (more meat). The great thing is that muscle memory does this adjusting for you so practise.... and it will come.
2nd tip: your bass setup needs to be right (unless you are Jaco) and for adjusting your bass’ intonation use a toothpick. It is as wide as your fretline, so if you create an artificial fret with the toothpick (slide it under the string) you can get intonation spot on.
Why does the body need to be wood? Why not graphite or acoustic foam filled polycarbonate? Alder, Ash, Mahogany, Walnut are all viable for graphite necked instruments in my opinion, but this is not an exclusive list.
The wet dream of bass amps, lovely...... just lovely. I have had the pleasure of using the dove cage pre version..... one of the best preamps I ever tried.