Thanks Alexis. In general no issue at all. The magnetic field of poles appears to cause no issue – although Im sure to someone using hing end bits and pieces they may feel a difference. Ive used quite a few hot rail and lipstick pickups also, which operate the same regardless of string numbers.Thanks!
MikeHawkey.com 
Interesting guitar.
Thanks
Gorgeously made!!!
Cheers!
Hi Mike, love your work. Question… are there any issues using 6 string pickups on 3 or 4 string electric uke builds?
Thanks Alexis. In general no issue at all. The magnetic field of poles appears to cause no issue – although Im sure to someone using hing end bits and pieces they may feel a difference. Ive used quite a few hot rail and lipstick pickups also, which operate the same regardless of string numbers.Thanks!