You want to look at Bravewood Guitars, the chap makes vintage fender relic'd instruments same as Nash except the necks are handmade to fit the body. If your paying up to £2k on a bolt on always make sure both parts are specifically made for eachother, otherwise you may as well keep trying out MIM Fenders until you get lucky!! Bravewood's sound great but the relic'ing looks very artificial, rub your arm on the nitro until it looks genuine otherwise it just appears speckly and crackled. The best ways to test bolt on basses is to hit the strings and feel the bottom of the guitar for resonance and also, to try pull offs on the higher frets acoustically and then check for sustain.