The thinnest neck I have on a 5 String is my 1987 Peavey Dyna Bass 5....but it's 35" long scale.....I recently purchased an Ibanez BTB 845v. Its a 5 string designed for EADGC....I converted mine to BEADG..the nut is 45mm and I had to file it for the strings but it's a 33" scale bass. I absolutely Love this bass so far and gigged it my last two gigs ( thanks again, Snert) but you may not like the feel or response of the conversion....still, the bottom line is: When you are thinking thin neck basses nowadays; always think Ibanez 
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