It is so, that i built a J-Bass Copy a few years ago in secondary school, but soon afterwards i bought a Yamaha, so the self-made bass never got any action. The main reasons were: Heavy as a bitch, it just broke my back, sharp edges of the frets/fretboards, and sucky pickups. Now i started to modify it, by ripping out the frets, adding some shapings, sanding of the colour. I'll make it fretless, although it doesn't have Ebony-Fretboard. My dad (who works as a carpenter (?)) told me, the wood of the fretboard is Oak. 1. Advice is about the pickup. I want to put in one single MM-PU. Good idea? I though about buying a Häussel-PU (german luthier). Any different suggestions? 2. I thought, i want to cut the body (ash) into two halfs, take out some wood (leave the wood in the "area" of the neck") cut a F-Hole in it, and make it a Semi-acoustic. How much will that influence the Sound? Is it good for doing that to a fretless-bass? Should i rather just make some rootings on the back and cover it, in order to make it lighter? Sorry for the "wrong" words sometimes. Thanks in advance!