Some years ago I bought a 4003 MID/BT/BH/FL. It was meant to be the fretless sister of my 4003 MID/BT/BH, but it turned out to be nog such a good buy. The color was totally different to my fretted 4003 MID/BT/BH so the identical sister idea was gone, besides this the bass also had several issues of which lacquer cracking was one.
I also like non-lacquered wooden (non-)fretboards on fretless basses. So yesterday I finally took the bass to
Gun Customs who is a fine luthier. He is going to put an ebony board on the bass. If I am happy with the result a refin will follow. I am thinking of the Fiat color Tech House Grey, which is a somewhat blueish gray. I think it would look fine with the black hardware and binding and the Ebony non-fretboard.

68 4001|73 4001 MG|75 4000 MG|81 4001S AZG|86 4003 MID/BT|86 4003 Shadow|88 4003s Blackstar|89 4003 Grey/BT FL|93 4004 Ci|96 4003S/8 FG|98 4003S/5 JG|05 650D|05 4004Cii/5 TG|08 660/12 JG|18 4003S/5 MID|19 4003S/5 WAL ||TR35B|RB 30||