The second bass of this type (I also confess to having built a 3 string version for mrs 3below). Aiming for fretless, 30.75" scale length and hopefully 7lb or thereabouts. Routing done before assembly this time, makes life much easier. Only 3 new mistakes so far, none of which are show stoppers. Chose to rout the preamp recess much more deeply in this version, then decided I did not like it. Sorted by inserting some wood strips and re-routing. I routed the the inner hole after the outer recess, it would have been much easier to do the inner through hole first. Routed a small clearance slot for the preamp cable on the inside at the wrong end. There are now two cable clearance slots.
The above shows a rough idea of where this is going. I will use an extension bar at the back to move the strap anchor to a suitable place, not going for the 1lb of lead this time. A year ago I bought some katalox fretboards (harder than ebony and far cheaper). Tried planing this today with the electric hand planer. Not good, it cracks easily and the planer pulls divots out even at 0.25mm depth. Will get the Scheppach planer/thicknesser on it next which will do 0.1mm.
Being idle I started to glue the box up without using my dowel jig. I had forgotten the joys of wrangling butt joints and wet titebond.